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'Once Upon a Time' season 6 spoilers: Dr. Jekyll and Mr. Hyde's backstory to be tackled in episode 4; EP hints more Oracle scenes in upcoming episodes

Promotional image for the ABC series \"Once Upon a Time\" | Facebook/Once Upon A Time

The latest promo for next week's "Once Upon a Time" season 6 has been revealed, and next week's episode will delve deeper into the story arc of Dr. Jekyll (Hank Harris) and the wicked Mr. Hyde (Sam Witwer).

 ABC has yet to release the official synopsis for episode 4, but its title "Strange Case" hints that the two Storybrooke characters will be the focus. After all, they both originated from "The Strange Case of Dr. Jekyll and Mr. Hyde." Although viewers already know them through the recent events in Storybrooke, the upcoming episode might offer more insight on where they came from and how they ended up in the magical town.

In the sneak peak for episode 4, viewers are given an idea of what happened to Mr. Hyde so long ago that led him to be such an important part in the story for this season. Moreover, it was also previewed that he has a past connection with Rumpelstiltskin (Robert Carlyle) that will be unraveled even further.

During the recently-concluded New York Comic Con (NYCC), executive producers Eddy Kitsis and Adam Horowitz shared teasers on what fans should look forward to this season. Aside from the previous Cinderella (Jessy Schram) episode, upcoming stories will focus on a Captain Hook (Colin O'Donoghue) tale plus an Aladdin (Deniz Akdeniz) and Jasmine (Karen David) arc. In terms of the mysterious hooded figure who kills Emma in her visions, Kitsis mentioned that "there's more oracle coming soon," adding, "you will have that answer by Christmas."

The EPs also teased that Emma (Jennifer Morrison) and Hook will take their relationship to the next step in season 6. "We're trying to show a real relationship," Kitsis continued in the panel. "What we like to explore with the two of them is dealing with the real stuff in a real way."

The sixth season of "Once Upon a Time" airs every Sunday night at 9 p.m. EST on ABC.