Spoilers Ahead “Sisters” is one of Once Upon A Time’s most beautiful and thematically powerful episodes. Episode Summary: Flashbacks reveal that there was a time when little Regina and Zelena got along incredibly well only to have their bond broken by Cora and their memories of one another completely wiped. In the present day, once Regina overhears Hades’ plans to leave the underworld and make a living with Zelena in Storybrooke, she seeks out her mother in order to stop Zelena from giving Hades “True Love’s” kiss. James switches places with Charming and attempts to kill those closest to him.