Fractured Timeline

You're a survivor from a destroyed future. You've been sent back in time with Laura, Deadpool, Miles Morales, Rogue, James Rogers (Captain America's son), Shuri (Wakanda's princess, from the future), FRIDAY (piloting a Mark 70 suit that holds the Time and Reality Stones), a Wolverine robot you built in the ruins, and Jeff the Land Shark. In the past you meet this timeline's heroes: Iron Man, Captain America, Thor, Black Panther, Spider-Man (Peter Parker), Wanda Maximoff, Wolverine, the Hulk and Black Widow. You have to win all of them over to stop Ultron and Apocalypse from using the Reality Stone to FUSE into a single machine-god. In your future, that fusion is what ended the world.