Hello! This is a multi-chapter AU story that includes The Flash, Arrow, DC's Legends of Tomorrow, and Supergirl. It deviates from the original plot after/during LoT 2x17, Flash 2x21/2x22, Arrow 2x21, and Supergirl 2x19/2x20. So, whatever happens in the season finales doesn't have any affect on what happens in this story. I think I'll be better at updating this time, but Finals are coming up so I won't be able to write as much. But please, enjoy the read, and let me know what you think! -LowTide1322

Chapter 1: Team-up

The Waverider

Sara extended her hand outwards to Rip. She was going to miss him, that was for sure. Even after all this time without him, he still felt like her captain, like she had so much left to learn from him. But here he was, asking her permission to leave. She smiled as Rip shook her hand.

"Stay out of trouble," she said.

"Well, without you lot," he joked, "that'll actually be quite easy." He began to walk away and Sara grinned again. That would most likely be true.

Sara hesitantly turned around to go back towards the bridge, when suddenly there was a loud bang and found herself thrown into the wall. Rip eventually slid down alongside her.

He sighed. "I spoke too soon, didn't I?" he said just loud enough over the blaring sirens that sounded all throughout the Waverider.

Sara rolled her eyes as they scrambled to stand. The timeship was tipping making it nearly impossible to move, let alone run. She thought that the worst of the time storms were over, but apparently their meeting with themselves caused much more destruction than any of them would have predicted.

"Is this another time storm?" Sara yelled over the alarms.

"It would appear so, but this feels much bigger than the last one; almost as if time is ripping itself apart!"

"What the hell does that even mean?!" They continued to stumble through the corridors of the Waverider. When she would be strolling about the ship, Sara felt like she could get from one end to the other in no time. Now? It felt like eternity. Whatever caused the timestream to behave this way, whether it was the Legends or some large time aberration, she wasn't sure they'd be able to fix it. If Rip was frightened, then there should have been good reason for her to be, too.

Finally, after what felt like hours of stumbling and crashing and falling through the hallways of the Waverider, Rip and Sara made it to the bridge where the rest of the team seemed to have gathered. Well, more like each clinging to one another or a chair of the Waverider. Through the window in front of the control system, the team could see the usual green of the time stream flashing with what looked like black lightning.

"Dear God…" Rip mumbled as he watched the time stream flash in and out before their eyes. This—this couldn't just be any time storm, time quake, or anything the Time Masters had prepared him for. Time was literally fading out of existence, and he didn't want to know what that meant for the Waverider.

The flashing began to subside outside the time ship, only to reveal a gaping hole in the time stream; an abyss where futures upon futures were supposed to be written. Now, they were all gone. The Waverider suddenly became eerily still and lightly kept bouncing off of the black hole rather than falling in, like there was a soft wall in front of them.

Jax was the first to speak. "What...what just happened?" came his shaky voice.

Rip slowly rose from behind one of the chairs in the control room.

"I'm not entirely sure, Mr. Jackson, but I've got a very bad feeling…" He strode to the main console, "Gideon?"

The grainy image of the AI appeared before the Legends, flickering in and out due to the damages done to the ship.

"There has been a massive aberration in the time stream. Any path forward from this point on no longer exists," the AI explained.

"And what does that mean?" Nate stumbled as he tried to stand up.

"Time does not exist past the date April 25th, 2024."

The Legends all stared at each other in disbelief. They'd dealt with nearly everything that could be wrong with time, but this...this was so much different—so much worse.

"Gideon, uh, care to elaborate? How could time not exist?" Ray asked after a long beat of silence.

"On April 25th, 2024, the multiverse in its entirety is destroyed; and time along with it," Gideon projected images of Central City and Star City of Earth-1 enveloped in red skies. And then the sky—

The team looked on in horror as the sky itself seemed to split open; dark matter seeping into the world and then...nothing. Thankfully, the projection ended and the horrible picture disintegrated.

Professor Stein thought that the images looked strangely familiar, when suddenly he remembered. The newspaper article that Eobard Thawne kept in the time vault at STAR Labs. One of the headlines read "Red Skies Vanish", and it seemed that in the future the skies remained red, and the multiverse ended because of it.

"I've seen these images before," Stein admitted. "Eobard Thawne's time vault back at STAR Labs, he had a newspaper from the year 2024 with a headline that read 'Red Skies Vanish'. Evidently, this new aberration causes the 'red skies' to continue to exist and destroy the multiverse."

"Wait, didn't we just defeat Thawne?" Mick piped up.

"But you mean the Eobard Thawne of 2014 and 2015 who was disguised as Harrison Wells, right Grey?" Jax helped clarify. It was easy to tell what the older man meant due to them having a psychic link. Jax could even picture the article that Stein was talking about. The more he pictured it in his head though, the more he noticed a headline that the professor failed to mention. "But, what about that other headline, 'Flash Missing, Vanishes in Crisis'? Is that about Barry?"

"I believe so. Perhaps Mr. Allen's Flashpoint is the aberration that caused this—"

"I think it's time we stop blaming Barry for things because of Flashpoint. We screwed up too when we went back and interacted with ourselves. We're no better." This realization dawned on Sara. She'd been so mad at the speedster for messing with time when she first heard about his mistake. But, she'd gone and done basically the same thing, if not worse, and she felt like such a hypocrite. Sara inwardly cringed thinking back on how she addressed Barry that day when all the teams were together to face the Dominators.

"I think figuring out what the aberration was is a good place to start as any. Gideon, can you tell us when the aberration takes place and what it is?" Amaya stepped into the conversation. She'd just decided to make a new future with Nate, and she didn't want that to all be for nothing now that there apparently was no future to be had.

"Of course. The aberration takes place May 22nd, 2017. The cause of the aberration itself is the death of Barry Allen, otherwise known as the Flash."

The silence in the room earlier was as loud as church bells compared to the silence that filled the main cortex now.

Even still, Gideon continued. "Barry Allen is meant to die on April 25th, 2024 in what is otherwise known as the Crisis on Infinite Earths. With his death, the Flash destroys the weapon that now destroys the multiverse. Captain Hunter is very familiarized with this event as well, should you have questions—"

"That's enough, Gideon!" Rip interjected. Yes, he'd always known that Barry Allen was supposed to die in the Crisis on Infinite Earths and possibly come back through the speed force (that bit was still unclear to him). He withheld this information from the team because he knew some of them would try to change the future to save their friends, and that would only make the situation worse. The Crisis on Infinite Earths was much like a fixed point in time that if interfered with would have devastating consequences on the time stream (the idea "fixed point" always bothered him, but they'd now seen first hand what an interference with one would do).

"Rip, please tell me Gideon is lying and you never knew about this." Sara didn't want to believe that Rip knew how close the world came to ending, and never went to help. "You knew that the multiverse was under attack and you never told us? We could have done something!"

"The thing is you all do try your hardest, but Barry still has to die, in any variation of the timeline. He's the only one who was fast enough to do it. But now it appears that he never does save the multiverse because he's already dead. That is what we have to focus on right now."

Nate crossed his arms over his chest and sighed. "So either way; we leave time as it is and Barry is dead, or we change it and Barry dies anyways. That doesn't seem fair."

"That, unfortunately, is the tragedy of the Flash. But he does die a hero…" Rip trailed off and hung his head. There really was no upside to this, so he didn't know why he even bothered trying to find one.

After a pause, Sara added, "No. A legend."

"You're right," Ray said. "And Rip's right too. We need to get the future back, our futures back, which means we need to fix this aberration."

"But we don't even know what happened. How are we supposed to stop this?" Amaya asked.

"I guess we have to find out what happened by seeing our friends in the aftermath," Sara suggested. She wished she could help beforehand but this was going to be the easiest way to figure out how to prevent the aberration. "Gideon, set a course for May 25th, 2017."

1 week earlier

Central City, 2017

May 23rd was coming way too fast, and Barry didn't have enough time. Usually, he had plenty, what with having super speed and all. But it was that same speed that apparently turns him, or at least a version of him, crazy in the future. So crazy that he'd actually kill the love of his life just to keep it. This present version of Barry would give his life to help save any of his friends. He could never understand why Savitar would do the things he does.

But if Savitar wins, then Barry will find out why soon enough.

Which was why he needed to defeat the evil speedster once and for all. Tracy had been slowly getting the speed gun—or bazooka, whatever H.R. wanted to call it—ready to trap the evil speedster in the Speed Force, just like Barry will do in the future.

Barry knew that saving Iris was his burden, that he himself had to do it, but he was nowhere near fast enough. The Speed Force wanted him to figure it out on his own, but they hadn't granted him the speed to do so.

He didn't want to admit it, but he needed more help. He needed someone even Savitar would have trouble defeating. Barry knew that by even thinking about this, Savitar knew his plan, but it didn't matter.

There was no way anyone could stop Supergirl.

"Barry?"

He heard a voice from behind him in the STAR Labs cortex. Iris's voice. He'd been so deep in thought he hadn't heard what the team was talking about.

"Yeah?" he turned to face his fiancée.

"You okay? I think we lost you for a minute there."

"Oh, yeah, I'm good, just thinking," he said. "Actually, I have an idea that could help us stop Savitar until Tracy can finish the speed gun—"

"—bazooka!" H.R. chimed in.

"Okay, speed bazooka. Anyways, I think it's time for another team-up."

A few hours passed as Barry and Cisco prepared to open another breach to Earth-38. At first, the team wasn't all on board with Barry's decision, especially since Savitar would know what they were up to. But, so far the evil speedster hadn't stopped them so maybe he didn't know about their plan yet. They also weren't sure that bringing Supergirl into the equation would be the right move, but if it meant preventing Iris's death then they couldn't go against it.

"Alright. You have one hour to find Kara and bring her back to this breach. Once she's here, we can start making a game plan," Cisco instructed Barry. "You sure this is the right thing to do?"

"I'm sure. I could never defeat Supergirl, so Savitar will never be able to either. Kara can help us buy some time for Tracy to finish the gun and find a sufficient power source. This will work, Cisco. I know it."

"Just make it back okay, Barr," Iris said and then hugged him.

"I'll always come home to you, Iris. Don't worry," he smiled and addressed the whole team, "I'll be back in a Flash." And with that, Barry sped into the breach that Cisco created and was on his way to Earth-38.

While he was going through the breach, he saw flashes of some strange images. One was of the team Legends' time ship being thrown around in what looked like a green and black wormhole. Then, there was another image of red skies over Central City. The pictures flashed again and he saw an image that was—oh God, he thought. The third image was of Savitar driving a glowing green spike through Kara Zor-El's chest.

Before he had time to react, Barry found himself in the middle of the DEO.

Several Agents had their guns trained on him, but J'onn stood in front of them and motioned for them all to stand down. Mon-El and Alex walked up next to him.

"Well, Mr. Allen. It's a pleasure to see you again. But might I ask what you're doing here?" The martian asked.

Still shocked from the images he saw in the portal, Barry stuttered before finding the right words to respond. "Uh, well, uh, I need Ka—Supergirl's help from, um, this, uh, evil speedster on my earth, threatens to...do something after he kills the love of my life…"

"Oh, so you need my help with Savitar now do you?" Kara flew in and landed in the DEO in front of Barry. She hugged him upon seeing him, and Mon-El narrowed his eyes at this. "It's so good to see you! I'm really liking all these extra-dimensional visits."

"It's good to see you too, Girl of Steel. I wish I was here just to visit, but I need your help again. I know you don't owe me anything, but—"

"You're my super-friend, remember? If you ever need help, I'm there. So, what are we up against this time?" Kara asked. She noticed all the DEO agents staring at the two of them and blushed. The term "super-friend" was their inside joke, but to everyone else if probably sounded really stupid. "Hey, you know what? Why don't we go and talk somewhere in private."

She lead him into one of the back rooms of the DEO, and J'onn, Alex, and Mon-El followed behind.

Barry filled them all in about what had happened since the last time they all were together. He told them about Abra Cadabra and traveling to his future self to figure out who Savitar was, but still didn't get any information.

"Did you ever find out Savitar's identity?" Alex asked.

It took awhile for Barry to respond. He still didn't want to believe it himself that he had become his own worst enemy that was going to kill Iris. The thought made him cringe. Not to mention that Kara might not want to help him once he told her.

"Savitar...it's me. Future me, anyway. Apparently I create a time remnant that was supposed to die, and didn't, and then felt shunned by me and my friends. And then he, or I, go off the deep end."

The three aliens and human stared at the speedster in disbelief. Mon-El moved slightly to stand in front of Kara almost as if on instinct. Barry turned away from them when he noticed this. Why would they want to help him? He had the potential to become a monster. And he didn't even mention the image that he saw in the breach of Savitar killing Kara with kryptonite.

Kara lightly shoved Mon-El out of the way and gave him a small glare before putting a hand on Barry's shoulder. "Hey, you're not Savitar. You're a good person, probably one of the best people I know. And I'm going to help you in whatever way I can."

"I'll come too—" J'onn began, but was cut off by Kara.

"No, J'onn. The DEO needs you here. All of you," she looked straight at Mon-El. She knew he would want to come with to try to protect her, but she didn't need protecting. National City needed all the help it could get.

"At least let me come with you," Alex said.

"No, Alex—"

"Kara, you're my sister, and I can't let anything happen to you. Besides, you guys could probably use another scientist on your team, right Barry?"

Barry nodded. With Caitlin gone, their team had gotten smaller and smaller. Alex Danvers would be a great addition to the team.

The group went back to the breach that sat in the main room of the DEO. Alex was saying goodbye to Maggie while Kara did the same with Mon-El.

"Just make sure you come back in one piece, all right? I know National City needs their Supergirl, but so do I," he said.

"Don't worry. I'll be fine."

Barry grimaced. If only he hadn't seen that one image on his way here, he wouldn't feel like he was leading Kara to her death. Maybe he should tell them, and stop this now—

"You ready, Scarlet Speedster?"

"Alright, let's do this," Barry replied after a pause. He grabbed hold of the Danvers sisters and went back through the breach. There were no images this time, thankfully, and before they knew it they were in the breach room on Earth-1.

"Welcome back to Earth Prime."

Savitar winced as he gained new memories that Barry Allen was currently creating. He smirked when he realized the Flash's plans.

"Good one, Barry. Bringing in the Girl of Steel. Well, mostly stupid." The god of Speed reached into his deactivated suit and grabbed a shard of kryptonite. "Does he really think I would go a day as Savitar without having some kryptonite handy?" he mumbled to himself.

"Well, this is much more interesting," Killer Frost sauntered into their "lair". "But how are you going to draw them out?"

"If the Flash wants to bring in a new member to his team, then I will too. Hold down the fort here until I get back, will you?" Savitar phased into his suit and was gone in a flash of blue lightning.

In quite literally the blink of an eye, Savitar appeared in an abandoned warehouse in Star City.

A man in a black hood instantly turned around and shot an arrow at the speedster, but it simply bounced off of his armor.

Savitar chuckled. "Adrian Chase—"

"Who the hell are you? Tell me or I'll kill you," Prometheus cut him off.

"I'm not here to harm you, Chase, I'm here to offer my assistance in exchange for yours."

"I don't need your help. My plans are moving along perfectly—"

"Except they won't. I'm from the future, and I know exactly how your plan plays out. And I will tell you this right now: the Arrow, Green Arrow, or Oliver Queen, whatever you want to name him, wins. I can tell you what happens if you help me out in return," Savitar explained.

Adrian thought this over. He had absolutely no reason to trust this...whatever this thing was. But, it did know that Queen was the Arrow and Green Arrow, and not many people knew that. Having a speedster do some of his work for him would probably shake Oliver up even more, make him call that freak in Central City, and then Prometheus could kill the Green Arrow's other teammate too. This was another perfect opportunity to break Oliver Queen, and Chase wasn't about to pass it up.

"Alright, fine. I help you, you help me. One condition; tell me who you are."

Savitar chuckled again as he knelt to the ground. He exited his suit as Prometheus removed his hood and mask. The two shook hands.

"I'm Savitar, the god of Speed. Or, as others know me, the Future Flash. I look forward to working together, Adrian Chase."

Thanks so much for reading! Review and let me know what you thought -LowTide1322