On planet Maltus ten thousand years ago, The Monitor's wife sends him to the temporal zone. There is a fluctuation and he is sent to the dawn of time of the anti-universe where he is met by the Anti-Monitor.

At the Vanishing Point, Barry has gone missing as Lex and Ryan work on a teleportation device. Kara volunteers to have Lex test it. It fails when he tries.

Barry comes back. He tried going to the Speed Force, as he thought he had been missing for two seconds, in reality he was gone for two months.

In Purgatory, Oliver has become Spectre.

Oliver shows up at the Vanishing Point. He tells them that the Anti-Matter is at the dawn of time to make sure the anti-universe is all that exists.

Oliver tells them that some of them must go to Maltus to stop The Monitor from accidentally creating the anti-universe years ago.

Oliver unlocks Barry's potential.

Barry sends Kara, Lex, and Ryan to Maltus.

The Anti-Monitor attacks and Oliver utilizes pieces of his essence to keep himself, Sara, J'onn, and Kate together. If any of them fall out of the Speed Force, they will be consumed by anti-matter. Barry must save them.

Barry meets up with DCEU's version of The Flash.

Lex, with enhanced powers from the Book of Destiny, knocks out Kara and Ryan.

Kate wakes up and sees Oliver and Ray talking about him being the Green Arrow.

J'onn is with Oliver and Kara as they discuss the invasion of aliens.

Barry finds Oliver defeating the evil Superman. He tells him he is actually in the Speed Force and Oliver remembers. Oliver tells him that he sacrificed his life for Barry and Kara to save their lives.

Lex finds The Monitor and makes him an offer.

Barry finds Sara dead with Laurel and Diggle. He wakes Sara up and takes off with her. He finds J'onn and Kate and takes them as well.

Kara and Ryan stop Lex from teaming up with The Monitor. Ryan convinces The Monitor to not go through with his experiement.

Barry takes Kara, Lex, and Ryan to the anti-universe at the dawn of time with the others. They are faced with the Anti-Monitor.

Oliver tells them the anti-universe is the only place where the universe can be reborn. The Paragons must hold off the Anti-Monitor.

Oliver faces off with the Anti-Monitor.

Together the Paragons create a new universe.

Oliver dies.

Kara wakes up on Earth-38. Kara is the only one who remembers the Crisis. Lex is being awarded the Nobel Peace Prize.

Kara meets up with J'onn. He remembers the Crisis as well.

Barry shows up to defeat the Weather Witch. Him and Kara find out that all of their Earths are now one Earth.

Construction workers find Nash unconscious.

J'onn restores Ray's memory. He tells Sara that he is going from city to city doing the same for their other friends. He has not found Oliver.

Sara goes to the Arrow bunker. J'onn, Rene, and Dinah have been given their memories back from J'onn. They are mourning Oliver.

J'onn restores Caitlin's memory. Nash is in her lab and wakes up. J'onn restores his memory as well. Nash apologizes for awakening the Anti-Monitor.

Beebo attacks Star City.

Barry, Kara, Ray, Mick, and Kate take down Beebo.

Nash warns the team of a surge of anti-matter in Star City.

A shadow demon attacks Barry and Sara. They find Ryan and save him from a shadow demon.

Nash tells them the Anti-Monitor is alive.

Ryan and Ray theorize that they can send the Anti-Monitor to a sort of microverse by shrinking him indefinitely.

Black Lightning saves Killer Frost and Mick from a shadow demon.

Most of the team fight the Anti-Monitor. He increases in size immensely.

Barry retrieves the shrink bomb and Kara throws it at the Anti-Monitor.

Diggle and Lyla have their daughter Sara back. Clark and Lois have two sons.

The president announces to the world that Oliver is dead.

The heroes hold a funeral for Oliver at a new bunker for all of them.

A creature named Gleek escapes its cell.