"Mother's Little Helper" is the sixteenth episode of the sixth season of the American fantasy drama series Once Upon a Time, which aired on April 9, 2017.
Meanwhile, Hook teams up with Blackbeard to find a way to return, only to end up back in Neverland, whilst Regina turns to an imprisoned Isaac when Henry's powers as the Author goes awry.
She takes Gideon's heart and orders him to find and kill Emma, then bring the Hrunting sword back to her, which will free her from the Dark Realm.
When they walked over to the dock, The Jolly Roger is nowhere to be found as it is in another realm, allowing Hook to reveal he meant to lose as Blackbeard had six aces in his deck, knowing he would be returning to Storybrooke either way.
In the Present Day, Gideon tells Emma that he needs her help to defeat the Black Fairy and as long as he has the napkin with her tears, Hook will not return to her.
Later that night at the clock tower, Emma meets with Gideon and agrees to help, on the condition that they exchange the spell to bring Hook back and Hrunting.
Meanwhile, back at the clock tower, Gideon discovers that the portal opened for a brief moment, allowing the Black Fairy to enter Storybrooke.
As part of his agreement, Isaac tells them to look at the "Once Upon a Time" book, and when Henry opens the pages, he discovers that they're blank because it will soon detail a description of the final battle, the end of Emma's story.