ABC's popular fantasy drama "Once Upon a Time" is full of cliffhangers and always keeps fans guessing. With a new episode airing this Wednesday, and the season winding down, viewers are on the edge of their seats. Providing some spoilers and teasers are executive producers Adam Horowitz and Edward Kitsis.

The executive producers both recently sat down for an interview with TV Guide to discuss what is in store for Sunday's all new episode and the rest of the season.

Horowitz spoke about Regina and Henry's relationship when talking with TV Guide.

"She will play a role in the attempt to get his memories back," he said, though he did not say for sure whether Henry will actually get his memories back.

Kitsis teased the fact that viewers will soon see Zelena's father, he will be on the show this coming Sunday.

"In fact, you will meet Zelena's father and find out the answer to who the Wizard is this weekend," he said.

As far as whether or not "Wonderland" plots and characters will find their way into "Once Upon a Time," Horowitz gave a definitive answer.

The story of "Wonderland" was always meant to be a one-year, close-ended tale. That tale is coming to a close and we're not going to be continuing those story strands on Once Upon a Time," the executive producer said to TV Guide.