The Flash

In "The Flash", worlds literally collide: Barry uses his superpowers to travel back in time and manipulate past events. But in an attempt to save his family, he accidentally alters the future - and suddenly finds himself trapped in a reality where General Zod has returned, threatening total annihilation and there are no superheroes to come to the rescue. Barry's only hope is to bring a completely different Batman out of retirement and free a captured Kryptonian - though not the one he's actually looking for ... Barry must save the world he's in to return to the future he knows. To do that, he has only one option: to run for his life. But will making the ultimate sacrifice be enough to reorder the universe?

Source: warnerbros.com