The Northern Irish actor, who loaned his voice to the show last year (14), will do battle with lead character Peter Griffin, voiced by Seth MACFarlane, in the special episode called Fighting Irish.

Executive producer Steve Callaghan tells Entertainment Weekly, "We learn that anytime Peter gets a few beers in him, he goes on a drunken rant about how he can beat up Liam Neeson... It's straight-up a drunk guy who's that stupid and thinks he can beat up a movie star. His skills are drinking a lot of alcohol, running off his mouth, and putting himself in situations he shouldn't be in... What's great about Liam is that he's so funny, and in some ways, the more serious he gets, the funnier he becomes."

The 250th episode will air on America's Fox network on Sunday (03May15).