A/N: Please don't kill me for starting another story, I promise it's going to be a short one (probably 3 to 4 chapters). Just had this idea in my head before the finale even aired so I just adjusted it to match the season 3 finale. It's just a little re-writing of the 2nd part of 3x23, with Bart Allen in it. I wrote this chapter a bit fast because I needed to get this idea out of my head and take the edge off from my other story. So please be kind if there's more grammar errors than usual and remember that English is only my 2nd language.

Of course Savitar was going to give it a shot at killing, blowing, them all away. What was Barry thinking when he tried to talk Savitar into joining their team? Savitar might've been Barry one day, he might've been the Flash a long, long time ago, but he was too far gone to be saved. Now, by bringing the evil speedster inside the lab, Barry put all of his friends at risk, again. But, to be fair, if putting a bomb inside the lab had been the God of Speed's plan from the start, Savitar would've found a way to do it, with or without Barry opening the doors of the lab wide open. Never had Barry been more grateful that Wally was now a speedster, he never would've been able to get everyone out in time on his own.

Central City's hero sprinted Julian and Harry out while was Wally was taking care of Joe and …Tracy. Oh God, Iris! After spending months trying to save her, Flash realized with horror that his fiancé was the one person they left in the cortex. Sprinting back inside at full speed, Barry grabbed the woman and ran, sensing his body ache under the all-out effort. He felt the explosion, he felt the force of it pushing his body and the heat scorching his back, but kept going until he was finally outside.

Barely making it outside, he looked in shock the building that slowly became his second house get illuminated by the white blast. His ears were ringing and he was breathing hard from the rage and …pain? His legs were shaking and his back felt like it was on fire, but it didn't matter, it was going to heal fast enough. Right? Someone was screaming his name, maybe more than one person. But somehow all of it sounded so distant, it sounded like it was coming from a distorted voice.

''Barry?''

''Barry? Man? You ok? ''

''Barr! BARR?!''

Barry felt his knees go weak and his vision getting blurry as the gravity attracted him toward the ground at an accelerated speed. The last thing he was aware of before passing out was a pair a hands grabbing his shoulders, trying to steady him.

***FLASHFLASHFLASH***

''How is he?'' Asked Joe for the hundredth time since they brought his son back to the apartment he was sharing with Iris.

''How am I supposed to know?'' Answered Julian, frustrated, leaning over his patient. He wasn't a doctor, he was no more than a mediocre medic, at best. No wonder they lost Caitlin to Killer Frost when he tried to operate on her. And even if he was a doctor, how was he supposed to diagnose what was wrong with Barry without any equipment? Everything they had at S.T.A.R. was either destroyed or not operational anymore.

Passing his hand in his short hairs, Joe exhaled in worry, walking a couple of steps away from the apartment's bed, brushing his daughter's shoulder in his way. A fact that the young woman barely even noticed, all her attention going to her too-still fiancé,

The philosopher's stone wasn't done doing damage on their base when Barry collapsed on the hard ground with a loud thud, barely avoiding to hit his head on the pavement thanks to Iris slowing down the fall at the last moment. Nobody could explain what happened; other than the burned marks on the young man's back, there was no sign of injuries to explain why Barry fainted. The team managed to take the speedster back to his bed where he was now laying on his side, shirtless, poorly made bandages covering his still un-healing superficial injuries. On the bright, while his skin was pale and his temperature low, his breathing and pulse were still strong and regular. For now.

''Why isn't he healing?'' Said Wally, pointing out the obvious, walking in circles in the room.

''I don't know.'' Answered Julian, worried, straightening up. They needed someone with real medical knowledge and real knowledge of the speedster's healing abilities. They needed Caitlin.

''It's just superficial, he's going to heal.'' Said Iris, trying to sound confident, way more than she was feeling, desperately needing, and waiting, for someone to agree with her. Preferably someone who had real arguments.

''We could take him on my Earth.'' Proposed Harry, standing in the back of the bedroom. ''I have medical equipments in there and some personal who knows a thing or two about this stuff..''

''And give away that my son is a speedster? I don't think so.'' Argued Joe.

''I don't wanna sound selfish right now.'' Added Julian, looking away from his patient. ''But, what about Caitlin? And Cisco? We need to deal with Savitar before he has the time to do whatever the hell he's planning to do before vanishing.''

Julian was right, they needed to take care of Savitar, stop Caitlin and save Cisco. All of that was now resting on Wally's shoulders.

''Son.'' Started Joe, seriously turning toward the last standing speedster. ''You think you're up to the task?''

''Yes, I am.'' Answered Wally without missing a beat.

Rush of wind and lighting entered the room in the next moment, announcing the arrival of a speedster, making everyone tensed up. Savitar? Had to be. But, no, it wasn't him. It was, a young man in his early 20s, with dark short hair, wearing a red and white speedster suit, complete with red gloves and goggles.

''No, you can't do it.'' Said the speedster, without wasting any breath on introduction.

Just what they needed right now, a new, unknown, speedster and yet, weirdly enough none of Team Flash felt their life being threatened by his presence. There just was something so familiar about that man. It still didn't stopped Joe from instinctively and swiftly position himself between the new arrival and his unconscious foster son, his hand ready to go reach for his gun's handle in an instant. Wally snorted, advancing right in front of the new speedster, arms crossed on his chest in defiance. Who was that person? Who did he thinks he was, coming in and criticizing his abilities like this?

''Who are you?''

''My name is Bart…I'm coming back from the 30th century to warm you that the future is shifting. The future is in danger.''

''Seriously, mates.'' Said Julian, advancing next to Joe and addressing his team. ''How many evil speedster from the future have you pissed off?''

''I'm here to help you.'' Said Bart, unphased by the accusations. ''If Barry Allen dies, it's going to push off the first domino leading to a very dark path that we can't let it happen.''

''Why should we trust you?'' Rudely asked Harry.

''Allen isn't going to die from a couple of burns.'' Added Julian to defend Harry's point. There's no way they were going to put Barry's life, all of their lives actually, into some unknown speedster pretending to be from the future. It was all mind games.

Of course the team's skepticism was understandable, but it didn't stop Bart from being slightly annoyed.

''Wells, from what I understand, you became part of the team because Barry gave you a blind chance. And, Mr. Albert-'' He looked at Julian straight in the eyes, seriously adding: ''It wasn't just a normal blast. When the Philosopher stone exploded, part of that stone entered your friend's body and it's affecting his Meta's cells, that's why he's not healing and that's why he's going to die if we don't do something. ''

Iris gasped at the words, this speedster had to be lying, it had to be a trick. But, why else would Savitar just leave like that unless he knew he just needed to slightly injure Barry to kill him and take his past self into the abyss of death with him? Right next to her, Harry was frowning, something was still off about this new character, there was definitely something important that Bart wasn't sharing with them.

''Arg.'' Suddenly groaned Bart, victim of a sharp and sudden pain, bringing his left hand to his forehead, eyes closed in agony, his body tensing up badly.

Julian moved forward, grabbing the speedster other's arm to try and keep him stable while Wally uncrossed his arms, undecided about this turn of event.

''Bart? Are you ok?'' Asked Joe.

The yell of pain that came next was coming from a speedster, but not the one standing and the intensity of it sent chills in everyone's spine. Coincidentally, at the exact same moment that Barry's pain seemed to grow, Bart's hand turned ghostly.

''Oh God. '' Whispered Julian. ''What's wrong?''

''It's….arrgg...Barry. I…to…d…you.'' Articulated the new speedster with difficulty.

''If Barry dies, so do you.'' Instantly understood Harry.

A/N: Leave a comment if you liked it. Want more of it?

I know there's already a lot of Bart stories in here, hopefully you'll like this one too :)