The justice league

Superman, Batman, Wonder Woman, Green Lantern (John Stewart), Martian Manhunter, Hawkgirl, Aquaman, Green Arrow, Black Canary, and Zatanna will face the ultimate enemy, and only one of them will make it back alive.

Justice League (Prime Earth)/Gallery | DC Database | Fandom

After turning his then adopted son, Thanos, into a pile of ashes and preventing a future where he doesn't win and where the heroes survive. He changed the future. But no, he did not. He just prevented one out of many possible futures. So, right now, Castle has went to another universe so to speak, so he can prevent things from going wrong there. He knows he'll see familiar faces, but they will not be the people he knew on his earth. Will Castle be able to save this new world? Or will it have…