Kieran Culkin Will Be Playing the Devil on ‘Family Guy’ for a Long Time (EXCLUSIVE)

Kieran Culkin had a lot of fun playing the Devil on “Family Guy” — so much fun, in fact, that he would like to play the show’s Devil for the foreseeable future.

“He was really game, wanted to have fun with it and at the end insisted that if we go back to the Devil it’s gotta be him,” co-showrunner Alex Sulkin tells Variety. “He wants to be the ‘Family Guy’ Devil forever going forward.”

“And we’ll gladly take him up on that,” adds co-showrunner Richard Appel.

The long-running animated series tapped the “Succession” star to play the Devil in its special Halloween episode, “Happy Hell-o-Ween,” airing Oct. 5 on Hulu. It opens on Stewie and Brian, dressed to the nines, desperate to attend a star-studded Halloween party on Block Island that’s only accessible by ferry. As the party ferry is about to disembark, they spot a man drowning in the water and contemplate whether to save him or attend the soiree, which Stewie is particularly desperate to attend since he’s heard the actor Eddie Redmayne may be in attendance.

“Without reducing Stewie to any type or specific taste, Eddie Redmayne just immediately felt like the kind of guy Stewie would be drawn to versus… Kate Upton,” explains Appel. “Let’s just say he’s a pretty man, and Stewie can appreciate — just objectively, without revealing anything about who he is — that a pretty man should be respected.”

Stewie and Brian opt for the bash, only to be killed shortly thereafter and sent to waiting-room purgatory, rubbing shoulders with a Boy Scout leader and Larry Nassar. The duo think they’re headed to the heavenly afterlife only to arrive at the office of the Devil (voiced by Culkin), who seems overwhelmed by his job.

As for their depiction of Hell, including, among other things, the actress Jamie Lee Curtis being tortured (she’s there because she’s “getting a bit much”) and a famously kind ex-president, Appel maintains that the fun was in who they could drop in there that audiences wouldn’t expect.

“We just started with Burbank and went from there!” he jokes. “Our depiction of Hell is going to be surprising because of who you find in Hell. That’s where we could put our own twist on Hell.”

According to Appel, every “Family Guy” episode, from table read to final cut, takes about 14 months. (It also has a 60-piece orchestra perform for every episode.) The lengthy process ensures that the team must avoid timely subject matter. “We can’t be a ‘Tonight Show’ monologue because we can’t produce it that fast,” he offers. They also can’t pay their guest stars terribly much. “We happily discovered that [Culkin] is a fan of the show and he enthusiastically embraced it,” Appel continues. “And no guest star does it for the paycheck because even ‘The Simpsons,’ where I was thirty years ago, pays guild minimum.”

Sulkin, who directed Culkin’s Devil, recalls the actor doing “a lot of his own lines” as the Devil, and found himself tickled by just how much the actor was like his character Roman Roy on “Succession.”

“He was startlingly like his character on ‘Succession,’ which was very fun,” says Sulkin. “It’s nice when people are the fun versions of how you know them on TV.”