"Once Upon a Time" season 4 spoilers show that Rumple is the series' "big bad" but there are other villains who can also hold their own. Meanwhile, the creators of the show has debunked the Sorcerer theory.

Showrunner Eddy Kitsis teased season 4 spoilers for "Once Upon a Time" during an interview with TVLine.

"Rumple is absolutely the Big Bad," he said. "And I would also say that the three women can more than hold their own. It's a very formidable team of evil coming our way."

Kitsis also debunked the fan theory that the Sorcerer will turn out to be Yen Sid.

"The sorcerer from Fantasia? Yeah, we can rule that out," he said.

Co-showrunner Adam Horowitz then added: "The Fantasia story is a jumping off point. We have something else in mind for the Sorcerer's background."

Horowitz also said that the Sorcerer's storyline will be revealed in 4B. "There are some assumptions that characters are making," he said. "But yes, everyone is assuming that that's the Sorcerer's mansion. And some are wondering if he is or isn't the Author."

The showrunners also said that they are going to explore Emma and Hook's romantic relationship after their kiss in last episode when she returned his heart to him.

"We felt like it was a sweet moment between the two of them, her returning his heart and then the kiss. Could there have been a lot more? Yeah. But there's still plenty of episodes left in the season," Horowitz said.

Kitsis added: "We thought the kiss and the way she put his heart back said [a lot].... But the truth is they're a couple that is continuing, so we'd rather watch them grow together and see what happens."

Stay tuned for more "Once Upon a Time" season 4 spoilers, which will be published here as soon as they come out.