The voice actors and producers behind Family Guy gathered at Comic-Con in San Diego, Calif. Saturday and revealed some major news about the upcoming season.

Family Guy executive producer Steve Callaghan dropped a bombshell about the new season at the start of the panel.

"One special episode we have for the fall," he began, "we're going to kill off one of the Griffin family and replace them with a different character."

This means that Peter, Lois, Stewie, Brian, Chris or Meg will be killed off, and Callaghan warned that it could be any of those six.

As far as regular episodes go, Callaghan revealed that there will be an episode that pays homage to Grimm's fairy tales.

"From time to time, we like to do an episode where we take our characters and put them in familiar works of art," he explained. "It's kind of theft, but we pretend it's an homage."

The producers also announced that there will be many celebrities lending their voice to the new season, including Ashton Kutcher, Adam Levine, Liam Neeson, Bryan Cranston, Conan O'Brien, Peter Dinklage, Jeff Daniels and Jon Cryer.

Additionally, there is going to be a crossover episode with The Simpsons, though the episode will not air until Fall 2014.

"There may or may not be a five minute chicken fight between Peter and Homer," said Family Guy executive producer Rich Appel. "It's a possibility." One of the biggest recurring gags in Family Guy features the plot being interrupted by a five minute fight between Peter and a giant chicken.

As for the possibility of a Family Guy movie, the producers are not ruling it out though they don't have any immediate plans.

"There is an idea, and we'd like to do at some point," Callaghan said, discussing a potential movie. "It will happen, but we don't know when."

Season 12 of Family Guy will premiere Sunday, Sept. 29 at 9 p.m. on Fox.

In the mean time, watch this five-minute clip shown exclusively at Comic-Con previewing the new season:

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