Plot summary
Regina and Emma try to magically trap the Evil Queen in the World Behind the Mirror, but she traps them there, where the Dragon is already imprisoned. Henry prepares for a date with Violet; the Queen impersonates Regina and tries to manipulate him but he recognizes her. Emma and Regina discover Sidney was building a mirror portal out of the world and try and finish it, but the Evil Queen forces the Dragon to attack Emma and Regina, using his heart, and tries to make Henry kill the Dragon with the Hammer of Hephaestus; he instead uses it to free his mothers.
Mary Margaret and David adjust to living in shifts. Belle asks Zelena to help her escape Storybrooke via magical portal, and they form an alliance with Aladdin and Jasmine. Aladdin steals the Genie's lamp and the Sorcerer's wand from Gold's shop, but Gold takes the wand back from Zelena and puts a magical tracking device on Belle. He asks the Queen to kill Zelena, as the connection between his and Zelena's hearts protects her from him.
Credits
Adapted from Wikipedia contributors, Once Upon a Time season 6. HTML formatting and reference markers removed.