Author's note:

Greetings readers...!!!

For the last one year, I have been constantly imagining how different interactions and situations would arise because of the pairing of these two characters. They both are my favorite superheroes and I really wanted to write a story about them facing the ups and downs of living a hero's life together.

Spider-Man is someone whom I have admired since childhood. He is definitely the perfect superhero for me. This character has the right balance of light and darkness in him. Infact, Peter has had his fair share of losses but he always bounces back, or swings back, stronger and never fails to maintains his light hearted persona. The fact that he has a genius level intellect as well as reasonably cool superpowers just adds up to his already great image.

In this very story, the events in Spider-Man's life have taken place in the following order:

1. Spider-Man Homecoming ... 2. The Amazing Spider-Man ... 3. The Avengers ... 4. The Amazing Spider-Man 2 ... 5. Age of Ultron ... 6. Civil War ... 7. Infinity war.

So, yes, Peter Parker isn't a novice teenager but is a 26 years old full fledged Avenger and he has been a superhero for more than 11 years. He has experienced everything that has happened during the course of each of the events. Also, events like Peter getting his powers and Uncle Ben's death have happened before homecoming. On the other hand, he was recruited as an Avenger right alongside the core team by Tony Stark himself.

As far as Supergirl is concerned, well what do I say about her. She is just brilliant in every imaginable way. The Girl of Steel is beautiful, strong, smart, brave hearted, and can practically shoot lasers out of her eyes. Kara inspires hope and optimism with the most sunny attitude imaginable. This what makes her a standout hero.

Now, my story takes off from, as the summary suggests, the Episode 19 'Myriad' of the first season of Supergirl TV show. That clearly means it's early days for Kara in the superhero business.

I know, some of you may not like the idea of Supergirl being very less experienced as compared to Spidey. But, this Myriad crisis was the best time to introduce Spider-Man in that world, according to me. So, yeah, if you do have a problem... Then just deal with it.

All right, I guess that is all I have to say for introduction and the backdrops of both the superheroes.

But before I get started, I request all the readers to vote for the chapters and the story if you like it. Also, do leave comments, feedbacks and suggestions about how the stories should proceed. To be honest, this is just my second shot at writing, so your ideas are really welcomed because they would help me improve.

DISCLAIMER: I do not own any characters used or mentioned in this story. This is purely a work of fanfiction with a non-profit motive.

Okay... So... Here goes... Nothing!!!

PROLOGUE

Universe - 616

Planet Titan

To say that the day was eventful for a certain 26 year old Peter Benjamin Parker, would be a serious understatement. From fighting a mad titan on his own home planet to dodging a literal moon which was thrown at him by the said mad titan. He had experienced it all. Peter had fought aliens before on Earth. So, a literal fight on a different planet in outer space wasn't exactly something impossible for him but it would still take some time to sink in.

Now, standing in his new but quite damaged red and blue coloured Iron Spider Armour amidst the ruins and rubble of the orange skied and dust filled dead planet Titan, an exhausted and wounded Peter was still trying to comprehend the events that had transpired in the last few hours. Thanos had just defeated him, Tony, Dr. Strange and the Guardians singlehandedly. Infact, he had nearly strangled Strange and stabbed Tony before disappearing into a portal just moments ago.

Peter raised his head to gaze at his beaten and bruised teammates around him. Tony Stark was lying on a clatter of rubble, looking completely drained. Dr. Strange had just been in a slumped position on the ground with his back leaning against a surface and his eyes portraying a lost look as he too tried to believe everything that had happened. Drax and Peter Quill stood on the other side of Peter as Drax had his left arm placed around Quill's shoulder for being able to stay on his feet. Finally, Mantis and Nebula just stood solemnly beside Drax. Watching his friends in this state, made him realize the actual gravity of the entire situation.

They had failed. Thanos had easily acquired the time stone from them and now he had 5 of the 6 infinity stones. Truth to be told, Strange surrendered the time stone to Thanos so that he would spare Tony's life after stabbing him. Hence, to know that he was just one stone and a snap of his fingers away from wiping out half of the universe sent shivers down Peter's spine. Vision's mind stone was the last one left and though Earth still had heroes Captain America and Thor, he doubted if that would be enough to stop Thanos from completing his gauntlet because the titan did quite easily beat Iron Man and Dr. Strange, arguably the two strongest heroes of Earth. A mixture of emotions of guilt, sorrow and disappointment swarmed through Peter's mind as reality dawned upon him. The fate of half of the universe had been decided and no one could stop Thanos. Billions were going to die and there was nothing that they could do to prevent it. Everything was lost.

"Oh my God!...Aunt May!" Peter gasped as his eyes widened and his soot and blood covered face clearly displayed a horrified expression. The fleeting thought of May being in the doomed half of the universe's population that would be eventually erased by Thanos, terrified him beyond reason. She was his only family and there was a huge possibility of her being wiped out. Tears started to flow down his eyes and he quickly shut them tight before he grabbed his head in his hands, feeling completely helpless.

However, he was pulled out of his train of thought when he heard Tony grunting in pain. Peter quickly looked up to him and saw that he was trying to get back on his feet from his half lying position. Thankfully, he had sealed his stab wound by spraying nanites on it through the left overs of his Bleeding Edge armour. So, atleast he wasn't bleeding out but he did sustain a lot of other injuries which made it really difficult for him to even get up.

Watching Tony struggle, made Peter even more disheartened. Stark's face clearly mirrored the same emotions that were whirling inside his own mind now. He looked like a man who was lost, distraught and had given up. This was polar opposite to Tony's real personality. Yes, he had his fair share of fears, insecurities, mistakes and even potentially life ending events both during and before his time as Iron Man. But, he never gave up no matter what the situation. It was this 'never say die' attitude of Tony Stark that had inspired both Peter Parker and Spider-Man to a huge extent. These traits always made Peter to look up to Tony as both his idol as well as a mentor, right since the time he himself donned the mask.However, right now, the man was just a pale shadow of himself and was trying really hard to just get back on his feet.

Deciding to help him instead of just standing and watching, Peter hastily wiped the stray tears off his face, grit his teeth and limped towards his friend. Walking was actually quite difficult for Peter as his entire body body ached. He himself was severely hurt, specially his back suffered a lot of damage. After all, Thanos did grab him by the neck with his gauntlet covered hand and brutally slam him on to the hard ground. At that moment, Peter felt certain parts of his spine shattering. Something inexplicable also happened at that time, the energy from the three infinity stones flowed into Peter. He thought of it as an energy blast which was going to blow him away when the energy engulfed his body. But, the energy just vanished into thin air in the next second and he felt was a tingling sensation. Then the pain from the slam came and his entire body ached like never before. If it wasn't for his regenerative abilities and greater damage absorption capacity of the new Iron Spider suit, his back would have been smashed to bits and he definitely wouldn't have been able to stand, let alone walk.

"Stark, you okay man?" Peter asked in a concerned tone as he bended over and extended his metal armour clad hand to help Tony stand up, upon reaching up to him.

"Well, what do you think Parker?" Tony scoffed and rolled his eyes at Peter's cliché question, using one had to point towards the gashes on his face that were covered in blood, while grabbing Peter's hand with the other.

Stark's nonchalant antics made Peter chuckle airily and he replied in his own carefree style by shrugging his shoulders, " Well... uh... I don't know. You kinda look like someone who just got his ass handed to him by a crazy giant space titan." He told him with a tired but suggestive grin before proceeding to pull his friend back on is feet.

"Yup! Couldn't have said it better myself." Tony laughed and nodded, once he was able to stand properly with some more help from Peter.

But the mood of ignorance and nonchalance, which both of them were desperately trying to create in order to avoid the dreaded truth, vanished in mere seconds when the feeling of guilt resurfaced in Tony, making him sigh in defeat and look down towards the ground," And now the fate of trillions of people lies in the hands of that genocidal maniac. The worst part is that there's nothing we can do to stop him. Coming to this planet to fight him was a mistake. I made the decision. It's all my fault. I really am the man who killed the Avengers and then half of the universe."

" Just stop...stop blaming yourself, Tony. You nearly gave up your life to stop Thanos. That's the most any of us could do." Peter assured him and placed a hand on his shoulder, forcing Tony to look up and directly into his eyes," This screw up isn't your fault. It's no one's fault. We all made that decision of fighting Thanos on his home turf and it wasn't a mistake. Each one of us fought in the best way they knew and that includes you too. I guess wafer face is perhaps all too powerful and unstoppable. But, that doesn't mean you failed. So, don't give up at least on yourself. All isn't lost. There's still a glimmer of hope left. I know it's a long shot, but maybe our friends back on Earth can somehow sto--"

"Something's happening!" Mantis warned, abruptly cutting of Peter, as she felt inexplicable sensations throughout her body. Moments later, there was nothing left of her body. It had completely disintegrated into dust granules that piled up in a heap where she once stood, seconds ago. Drax and Quill followed suit just instantly, as there bodies too were turned into nothing but heaps of dust.

"Tony... Peter..." Strange called out, making both of them turned towards him, before glumly shaking his head, " There was no other way." As soon he uttered the last word, his body too started to fall apart into and he met with the same fate as the three Guardians.

The writing was on the wall. Tony and Peter's most dreaded fear had taken the shape of reality as they both incredulously stared at the piles of dust that used to be their friends, not wanting to believe what they were seeing. This meant that Avengers on Earth had failed too. Thanos had won. He had successfully collected the last mind stone and had snapped his fingers. Now half of the universe's population would be erased in a matter of seconds.

Before Peter had the chance to again worry about Aunt May and the other people back on Earth, the hair on the back of his neck suddenly rose and his body tensed. That was followed by an unbearable headache out of nowhere and that made him shut his eyes as tightly as possible and his face scrunched up. If it wasn't already painful enough, sensations of indescribable pain flood through his entire body in the moments that followed. It felt like he was being ripped apart to shreds but his body was trying it's hardest to resist this invisible force in order to prevent itself from being ripped apart.

For the first few seconds, he was completely oblivious as to what was happening to him. But, all the panic, confusion and pain vanished into thin air when he figured the actual reason of his condition. He was going to disintegrate into dust too.

He was being erased from existence just like Strange and the Guardians.

It didn't happen swiftly, as was the case with the others, because he could still see and feel his entire body as each and every part of it was still hurting a lot. Maybe it was because of his regenerative abilities resisting the disintegration or it was due to some other power he had. But, all that didn't matter right now because he knew that he was just going to last for a few more because this force was just too overwhelming. He could feel his end catching up to him.

In those last moments, a variety of emotions swarmed into Peter's mind. On one hand, he felt horrible for all the other living people who were going to meet the same end as his. The spider hero desperately hoped that the other people whom he cared about, specially Aunt May, survived this. But, on the other hand, a sense of peace and tranquility hit his soul. Yes, there was no denying to the fact that, he as Spider-Man had made a lot of mistakes. Some of them were so big that it costed the lives of his loved ones such as Uncle Ben, Captain Stacy, and even Gwen. Though, what made him feel contended was that he had saved countless lives too both just as Spider-Man and as an Avenger. The good that he had done clearly outweighed the bad. That made him feel that he had done his best to fullfil his responsibility that Uncle Ben knew he had towards other people and now he could die in peace.

Death was indeed at touching distance now. Infact, it was knocking at his doorstep. His body had been drained out of energy was slowly starting to give up. The pain and resistance proving to be too much for it too handle. Standing felt like a huge burden as his legs were becoming weak with each eternal second.

"Stark, I don't... I don't feel so good." Peter muttered groggily to get Tony's attention, who had absolutely no idea of Peter's state because he was still shocked by watching the others turn into dust.

His head jerked towards Peter with a completely bewildered face, once he realized Peter's condition. He didn't require his genius level intellect to know that Peter was going to die too and it broke him from inside. This was one death he wished he never would have to live with on his conscience. But, here they were, Peter was on the brink of death and he was completely helpless to do anything about it. Another pang of guilt hit the billionaire hero as he again blamed himself for all the lives that were lost or were going to be lost.

"You're alright, Pete." Tony tried his best to assure him. Truth to be told, he was trying to give himself some kind of false hope in his friend's last moments. Though, both of them knew it was not going to work.

Peter shook his head in denial as he stumbled towards Tony and grabbed his shoulders before seeing him firmly hold both his forearms to prevent him from collapsing. A faint smile appeared on the spider hero's stressed face as his best friend was supporting him, even in his end times. Peter did find some comfort in the fact that Tony was going to survive this. In his book, if there was anyone who deserved a long life besides Aunt May, it was Tony Stark. No matter what everyone else thought him, Peter knew that the man had always worked for the betterment of the world and he deserved to live.

"I really don't wanna go. But, I guess... I... I'm out of options here." Peter gasped to get some air in his now burning lungs before continuing, " However, before I go, I just wanna thank you for everything that... that you've done for me. Iron Man was always my hero since I was a child. But you... you Tony, you've always been like that elder brother that I never had. Thank you man, for showing me what a real hero looks like. And yeah I just wanna--" He wasn't able to continue as his throat went dry and he started coughing blood on the ground. Darkness started to seep through the corners of his eyes and he knew the moment had arrived. Tony opened his mouth to say something but he gestured him to stop by raising his hand. He then breathed hard, gathering the last iota of energy left in him before continuing," Wait! I gotta say this one last thing... one last thing. It's a small request. If May survives this. Please... Please look after her. She'll need someone."

Tony just closed his eyes, trying his best to fight back the tears, and looked away before nodding.

Knowing that he had said all he wanted to say, Peter felt a sense of repose as he finally caved in to the temptation of surrendering to this force as his body's resistance drew to a close. His legs couldn't bear the gravity anymore and gave way as his limp body finally hit the ground backwards, taking Tony down along with him because he was still holding on to his shoulders.

This was it. Peter now could feel his body slowly coming apart into the same dust granules, starting from his legs. He just closed his eyes and waited for the inevitable. But, when he felt a grip on his hand, he turned his head to his side, he saw Tony who was lying on his side beside him and had propped himself up on a shoulder while holding Peter's hand with his other hand. He was staring at his about to die friend with a mixed expression of guilt and helplessness.

"I'm sorry, Tony." Peter whispered and looked at his friend for one last time before turning his head again in the other direction and he slowly closed his tired eyes as the darkness slowly consumed him and everything went still and quiet. His body eventually turned to nothing but particles of dust too, leaving Tony alone on this dead planet along with Nebula, who watched the entire commotion from a distance and could do nothing but feel sorry for the two of them.

In his last moments, when he had shut his eyes, Peter had thought that this was it. This was where his story would finally end and he could find peace and maybe even reunite with his parents, Uncle Ben and Gwen in the afterlife.

Little did he know that destiny had other life altering plans for him and Spider-Man both.

Universe - 38

Planet Earth

National City

"Was that good?" Kara asked nervously as she opened her eyes and got back on her feet. She had just kissed James Olsen in her dimly lit apartment in an attempt to speed things up between them. Now, she stood patiently to see Jimmy's reaction, her sea blue eyes staring directly into his as they searched for an answer.

But moments passed and Jimmy just kept staring back at her without uttering a single word. That made Kara even more tense. A pit started to form in his stomach and her sky blue eyes widened when the thought of her screwing this up passed her mind.

"Was it not good?" She asked anxiously and quickly clasped her hands on her mouth, bracing herself for the dreadful rejection. However, she got no response this time either as Jimmy continued to be in his state of trance.

Now, being utterly confused by his behavior, Kara tilted her head with her hands still looming on her mouth. But, then she felt a bit relieved when the thought of him being just too overwhelmed appeared in her mind. Maybe, he loved kiss and was just too happy to say something. Kara definitely did feel him kiss her back.

"Too good?" She tried again. This time a sheepish but hopeful grin graced her lips and she chuckled nervously,"I don't--"

To her momentary relief, he did react this time after few more moments of his agonising mindless stare. But, it was the last thing she expected him to do. James just turned around, walking away from the small table near the kitchen and towards the main door of the apartment.

"James?" Kara called him from behind in confusion. She was actually starting to worry about him. James's odd behavior couldn't have been because of the kiss. She knew him too well by now to not decipher that. He would have said something or at least would have reacted in some way, even if he didn't like it. Something was seriously wrong.

"James, are you okay?" She followed him worriedly, once he opened the the door and left the apartment. Once, Kara was standing just outside the door frame of her apartment, she saw something that confused and worried her even more. All the people in her apartment complex, were mindlessly walking down the common corridor and out towards the streets.

Not having a clue as to what was happening, Kara just stood there blinking at the now empty corridor with an incredulous expression on her face. At first, she thought of following James and the others but then decided it was better to take a larger view of the streets. So, she quickly entered back into her apartment and walked towards the large window besides the balcony, desperately hoping to not see something that she knew she was going to see.

Meanwhile, a stoic General Non stood in his black body suit, staring at the blue light beam emanating from the main energy core of Fort Rozz. This core was present right in the middle of the main ops centre of the best of operations of the rogue Kryptonians. The leader of the Kryptonians was clearly waiting for an update from his soldier about the launch of Myriad, his ultimate plan to take over the Earth.

"General!" One of his soldiers marched up to him and obediently informed him," Myriad has been activated."

Non nodded at his soldier and a victorious grin appeared on his face as he trained his eyes back at the blue beam. "For you, Astra. First National City, and then the Earth will be ours for the taking." He declared.

Back at her apartment, Kara's jaw dropped in complete disbelief once she saw, through the window, the scene that unfoled on the streets below. All the people in the city had left their homes, or their cars, or whatever else they were doing, and they were just mindlessly following each other in straight queues. She felt like she was watching robots who were programmed to do march like this as her eyes trailed along the endless lines of people.

Not being able to watch the people in their helpless state anymore, she tore her eyes away from them and stared at the floor of the apartment. She felt liable for not being able to protect the people. She could not do anything now to remove this trance that the people were in.

But, then it struck her. The only person who could reverse this effect was the person who was responsible for causing it in the first place. Kara knew fully well who the culprit was. It had to be him. It had to be her evil uncle Non. No one else could come up with something as maniacal as this.

Kara knew she had to stop him now, once and for all. If this was only his first step to take over the city and the world, then only Rao knew what else he had got in that psychotic mind of his. Instinctively, she thought of finding Non and forcing him to stop whatever he was doing to the people. But, her recent team up with the Flash had taught him to not run in blind without a plan. Besides, if something happened to her while fighting Non, there would be no one to protect this city from him and his soldiers.

So, she just let out an exasperated sigh and started pacing in front of the window with her arms crossed, mulling over the options she had. She could have taken J'onn and Alex's help but they were on the run from the DEO and were probably hiding somewhere away from the city. Hence, looking for them right now would be difficult and time taking. Also, Kara thought it was safer for both of them if they stayed away from the city and this mess.

Immediately rejecting that idea, she was about to consider her other option when something in the corner of her vision caught her attention. Kara quickly jerked her head towards the city and her eyes caught hold of the distraction. It was some kind of reddish purple light that had appeared out of nowhere and was glowing above the rooftop of the CatCo Worldwide Media building. She completely froze the the sight.

Was it Non? Was that glowing thing a bomb? Was Non going to blow up CatCo?

Questions like these rang through her mind. If it was really him, she knew she had to act and fast. She didn't have time to come up with a plan. Saving the building was her top priority now.

Concluding on doing the same, she ran to her bedroom, getting rid of the sleeveless yellow summer dress she was wearing before zipping into her red and blue Supergirl suit. When she was done, just seconds later, she appraoached the window and took a deep breath, floating a few feet in the air before flying out of the window towards her workplace.

Supergirl clenched her fists and her steely eyes lit up bright orange with a concentrated amount of heat vision as she jerked her arms forward, propelling herself faster towards the building. Her bright blonde hair and her cape both blew backwards when she descended towards CatCo's rooftop, crouching on one knee as she landed on the edge.

With her fists still clenched and eyes still glowing, she got into a fighting stance, ready to attack anyone who tried to stop her from saving the building. But, to her utter surprise there was no one else on the rooftop. She was all alone with the glowing light at the centre of the rooftop. Fearing that she flew into a trap, she quickly used her X-ray vision to check the entrance of the rooftop as well as the surrounding buildings to make sure no one was hiding and waiting to hit her.

Even after checking everything twice, she couldn't find a single threat. She was indeed alone. Maybe this glowing light did appear out of thin air and she just panicked and overreacted, thinking of it as a bomb.

But, that still didn't answer the question as to what this glowing light thing actually was. In an attempt to answer the same, Supergirl cautiously approaced the light by taking a few steps towards it. Just when she was about half a metre away from it, the intensity of the light suddenly increased and it bathed the entire rooftop in a sea of reddish purple. This forced Kara to sheild her eyes from the blinding luminosity and turn in the opposite direction.

The light lasted for a few more seconds before it suddenly vanished. Right in the next moment, a loud clanging noise was heard. It was as if something heavy made of metal had just fallen at the centre of the rooftop.

Supergirl hastily opened her eyes and turned back towards the centre, blinking a few times to make the blurriness go away. When her vision finally cleared, she saw a man lying on the floor and a bit of the same light glowing around him. She could finally she the man clearly after a few moments, when the leftover light died down too. The man had his eyes closed.

At first, she quickly appraoached him and knelt beside, using her X-ray vision to check his heart. A bit of relief was felt by her when she saw his heart beating. That meant he was just unconscious but not dead. It was only then that she fully took in the unconscious man that lay unconscious before her.

This mysterious man had ruffled brown hair and he looked quite young. Probably around her own age, she thought. He was also a bit taller than her with a good physique. But, the thing that caught actually Kara's attention was the suit that he was wearing.

It was some kind of metal armor. The chest, arms, gloves, boots and the mid-section of the abdomen parts of the armor were crimson red in colour with a black webbing pattern over them. Whereas, both sides of the abdomen and the legs part upto the boots were dark blue in colour. The armor also had black shoulder plates and pair of some kind of gauntlets attached around the wrists. Though, it was the large black spider emblem on the chest that was the most eye catching. The two upper legs extended upto the shoulders on both sides whereas the two on the lower side disappeared itno the blue of the side abdomens on either side.

For a moment or two, Kara really admired the armor. Specially liking the color combination as it was quite similar to her own. But, she quickly shook her head and gathered her focus back to try and identify this man.

This highly advanced metal suit and his appearance in a ball of light out of nowhere clearly meant that he wasn't some fancy dress weirdo. On the contrary, he was definitely a superhero like her and Clark. But, she tilted her head in confusion, because she had actually never heard of him before, neither did Clark ever tell her about a spider themed hero.

Realization finally dawned upon her after thinking hard for a few moments. She had not heard of him maybe because he did not belong to this Earth. She was pretty sure he was not an alien because she had just seen his heart. But, he definitely didn't belong to this Earth because he was a hero in some alternate Earth.

Meeting Barry Allen or the Flash of Earth-1 today morning itself, made Kara strongly consider this possiblity.

"Another hero from a different universe." Kara sighed, eying the unconscious man again," Oh boy! Things just got so much more complicated."

END OF CHAPTER

Author's note: Alright readers, I hope you liked the 'Prologue'

I know it isn't much and most of it is already seen on the screen by everyone. But, still I have written my own take on quite a lot of things.

Specially in Spidey's case, I tried to show how a more mature Peter would have reacted in that situation because the story needs a mature hero.

Also, for the record, I loved the Spider-Man that they portrayed in the movie. Tom Holland nailed it and that scene did make me cry.

Moving forward, I also highlighted Tony and Peter's friendship and how Peter is always inspired by Tony. That is definitely going to affect him in the forthcoming chapters.

Now as for Kara, I didn't focus a lot on her because this chapter was to mainly bring Spider-Man in her universe. But, she will obviously have a bigger role in the forthcoming chapters because the story will run along episodes of Supergirl. So, Kara will definitely be in the lead.

Coming over to the updates, I will try my best to publish chapter 1 asap. But, if I can't, you will definitely have it before the first weekend of July ends. To be honest, the next 3 weeks will be quite busy for me. I'm publishing this now because I really wanted to get my story up and running.

Okay then, guess that's all I have got for now.

Readers, please follow the chapter if you liked it. Your one follow, helps me to go miles. Comments and suggestions are always welcome. If you didn't like something, please criticize but please do leave a feedback.

Alright then guys, I see you again soon.

COMING UP IN NEXT CHAPTER: Peter realizes where exactly he has ended up...

* 29/06/18: Just fixed up some grammatical errors here and there.