Rumple's (Robert Carlyle) hatred of fairies will be revealed in the upcoming episode 9, titled "Changelings," of the sixth season of the American fairy tale adventure series "Once Upon a Time."

In episode 9, another part of Rumple's dark past will be unveiled. In a form of a flashback, Rumple will be seen capturing Jack (Nick Hunnings) and Jill's (Tammy Gillis) son in Fairy Tale land and use him as bait. He apparently wants to lure a powerful being toward him. In the present time in Storybrooke, Gold reveals to the Evil Queen (Lana Parrilla) about his intention to kill Zelena (Rebecca Mader). The Evil Queen's decision could turn things upside down for her sister.

Meanwhile, Belle (Emilie de Ravin) learns about Gold's scheme that involves their son. Desperate to protect her son from Gold, she asks for Hook (Colin O'Donoghue) and Emma's (Jennifer Morrison) help to get hold of the squid ink that is capable of immobilizing Gold. However, there are things that Belle has to lose and so she is forced to sacrifice something that could affect the lives of everyone in Storybrooke.

Jasmine (Karen David), on the other hand, retrieves the genie-less lamp, hoping she could use its powers to save Agrabah. Meanwhile, Aladdin (Deniz Akdeniz) does something to become her hero.

The promo trailer for the upcoming "Once Upon a Time" season 6 episode, "Changelings," shows Gold revealing his dark side again. He is returning to the beast who inflicts pain and revenge. He also starts negotiating with Regina's alter ego, Evil Queen, on killing Zelena. Belle, on the other hand, tries to do everything she could to protect her child from Gold.

In other related news, TV Line reported that the upcoming "Once Upon a Time" season 6 episode will see "Defiance" actress Stahma Tarr in a guest starring role as Black Fairy.

"Once Upon a Time" season 6 airs Sundays at 8 p.m. on ABC.