J'onn gave Alex, Brainy, Nia, and Kelly their memories of their past lives back.
Lena remembers everything that happened before the Crisis, thanks to Lex. He asks her to be his partner.
Brainy finds his doppelgänger.
Lena tells Kara that she has her memories and still refuses to forgive her. Kara pleads for her to work with her.
At the DEO, multiple versions of Brainy come forward, including a female Brainy claiming to be the director of the DEO. One of the Brainys dies.
The different Brainys are all from different Earths that were destroyed in the Crisis. They are dying off due to a virus.
Gamemnae is disguised as Jemma Cooper, Andrea's college mentor.
At the alien bar, Kara and Brainy discover there are more doppelgängers of other aliens, including the witches who woke Reign.
Lillian Luthor, with her memories restored thanks to Lex, now runs Luthor Foundations.
One of the Brainys reveals to Nia that he shrunk and bottled his Earth and that he killed a Brainy that wanted to prevent him from opening the bottle.
Female Brainy tells the team that if rogue Brainy releases his Earth, both Earths will be destroyed.
Gamemnae tries to convince Andrea to create a true virtual world.
Brainy tells Kara that his father placed his three personality inhibitors on his forehead when he was younger because he was afraid that he would become evil like his mother.
They figure out that rogue Brainy is getting the witches' help to open the bottle.
Kara, Nia, and Brainy confront them. One of Brainy's inhibitors is destroyed. Nia convinces him to take off all his inhibitors.
Brainy talks rogue Brainy down and promises him that they can find a safe space to open the bottle.
Kara and Nia bring the bottle to the Fortress of Solitude.
The Female Brainy tells Brainy that Lex is researching Leviathan. She tells him that she fought Lex on her Earth and that in order to save his world, he must work with Lex.
The two remaining Brainys leave to live in the Big Brain and give their life projectors to the original Brainy.
Lex tells Lena that death changed him. He uses the truth seeker to prove his loyalty to Lena. She agrees to work with him.
Brainy tells Nia that he can't be with her.
William tells Kara that he doesn't believe that Lex is good. He got a job at CatCo to get closer to Lena and prove Lex was behind his friend's murder.
Brainy tells Lex that he wants to help him defeat Leviathan. Lex tells him he needs information from the future, and they may be able to get it from someone who was just arrested -- a doppelgänger of Winn.