Seth MacFarlane has revealed that a Family Guy movie will definitely be produced in the future.

According to Entertainment Weekly, the Family Guy creator told UCLA students this week that he already has an idea in mind for a potential big screen spinoff for the Griffins.

MacFarlane said: "It's just a matter of when. It's hard to do that while you have the series going on at the same time; I think that's why it took The Simpsons 20 seasons to figure out how to do it."

The 39-year-old screenwriter further explained that he wants the film to be different to that of 2007's The Simpsons Movie.

He added: "We do know what the Family Guy movie will be. The Simpsons Movie, I thought, was hilarious, but the one criticism I would have is that it's a story they probably could've done on TV. There could've been an episode that had that plotline."

He further pitched in: "That's the challenge with animation. You pretty much can do any story you want, so what is the reason for the movie? We finally hit on the answer to that question, and it will be something that would be impossible to do on TV."