Cora and Hook face off with Mary Margaret and Emma in a race to secure the compass, which will point its holder to the portal into Storybrooke. But back on the other side, Regina and Mr. Gold, desperate to keep Cora out, put a plan into action that would kill anyone entering the portal - placing Mary Margaret's and Emma's lives in danger as well. Meanwhile, back in the fairytale land that was, Captain Hook travels to Wonderland and meets up with a vengeful Queen of Hearts.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Regina and Mr. Gold agree that they should destroy anyone who comes through the portal, even if it's Emma and Snow White. Ruby and Leroy get angry when they find that Gold and Regina took the diamonds from the mines, so Henry and Ruby set off to stop them from destroying Emma and Mary Margaret. Cora and Hook face off with Mary Margaret and Emma for the compass, while the events of how Cora and Hook met are revealed.