When Bishop gave Sara the "antidote" for the Zaguron sting, it was actually a primer so that he could make her clone.

Ava and the rest of the Legends are grieving Sara's death.

Kayla gives Mick until the third moon sets to save Sara before she takes the spaceship and leaves.

Bishop kills himself and gets a new clone. He tells Sara that he plans on making thousands of Sara clones by merging alien and human DNA. He will use them to colonize planets across the universe.

Behrad travels back to London in 1977, the date Sara was abducted. He wants to prevent her from ever being taken. The rest of the Legends, except for Ava, follow him and promise to help.

Behrad finds Sara and tries to get her on the Waverider, but he is unsuccessful because she wants to propose to Ava.

Mick finds Gary with a few Ava clones. They all find Sara and come up with a plan to stop Bishop.

Zari and Constantine try to get Sara to propose to Ava so that they can leave before she is abducted, but Sara stands her ground in doing it in her own time.

Zari figures out that Constantine's magic is gone.

Ava sees both versions of Zari and Constantine. She finds the Legends at their hideout. She scolds them and tells them to go back to their own timeline. She leaves and drinks to forget they were ever there.

Sara cuts her hand. It immediately heals, and she realizes she can regenerate. Sara finds Bishop and demands that he explains what she did to him. He shows her the strong alien he merged her with.

Sara uses a drug to paralyze Bishop.

Behrad comes up with a plan to save Sara that includes an exploding mannequin. It will take Sara's place while still releasing aliens into the timeline.

Spooner goes into the club to be the lookout. She accidentally runs into Sara. Spooner tells her about her alien background.

Nate from the future arrives. He tells them that their plan will release aliens into New York City during the Gilded Age and they take over Wall Street. Sara ends up getting abducted anyway.

Behrad runs out and tries to stop Sara from being abducted himself, but he is too late.

An Ava clone starts to make a clean clone of Sara.

Mick kills Bishop. Bishop starts to upload his consciousness to the cloud. Once it's complete, he'll be able to print himself from anywhere in the universe.

Mick convinces Sara to blow up the generators to stop Bishop. As a result, the clean clone of Sara is destroyed.

Sara, Mick, and Gary run into a few Zagurons when trying to find Kayla's ship. Kayla arrives and helps them fight the aliens. Kayla disappears. The rest of them retreat to the ship and fly away.

Sara, Mick, and Rory return to the Waverider. Sara reunites with Ava. They travel to 1970 London to tell the rest of the Legends.

Sara proposes to Ava.