‘Once Upon a Time’ episode 16 preview: The Black Fairy returns in ‘Mother’s Little Helper’ [WATCH]

“All of the darkness you’ve ever faced was born out of one soul: the Black Fairy,” says an ominous Mr. Gold (Robert Carlyle) in the promo for Sunday’s all-new “Once Upon a Time” episode, titled “Mother’s Little Helper.” Gold knows more about the show’s newest villain the Black Fairy (Jaime Murray) more than anyone else, as she is actually his biological mother. Watch the “Once Upon a Time” Season 6, Episode 16 preview trailer above.

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Gold and Belle’s (Emilie de Ravin) newborn son Gideon (Giles Matthey) grew up under the care of the Black Fairy in an alternate realm where time moves much faster than it does in our world. And now that the adult Gideon is in Storybrooke, he’s hoping that Emma (Jennifer Morrison) can help him take her down. “You will help me destroy the Black Fairy,” Gideon tells Emma, to which she responds, “I will never help you.”

“Challenging their most sinister foe means trusting their worst enemies,” the promo teases as Regina (Lana Parrilla) visits the former author Isaac (Patrick Fischler) in the Storybooke prison. Meanwhile in Neverland, Captain Hook’s (Colin O’Donoghue) desire to return home to Emma looks to be sidelined as he’s reunited with his arch rival Black Beard (Charles Mesure).

‘Once Upon a Time’ poll results: 54% say their favorite love story is Emma and Captain Hook

Find out whether Emma and Gideon can find a way to work together to destroy the Black Fairy when the episode airs Sunday night on ABC at 8:00 p.m. Here is ABC’s official plot description of “Mother’s Little Helper,” which does include mild spoilers:

Gold and Belle convince Emma to help Gideon, explaining that together they can stop the Black Fairy. Henry experiences a disorienting shift in his powers that forces Regina to seek counsel from the previous Author. Meanwhile, in Fairy Tale Land, Hook attempts to win the assistance of an old adversary by betting his most prized possession on a game of cards. And, in a flashback, the Black Fairy tortures young Gideon in hopes of molding him into the perfect apprentice.

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