Kieran Culkin Demands to Be the 'Family Guy' Devil Forever

Kieran Culkin has claimed the role of the Devil on "Family Guy" — and he does not intend to give it back.

The Emmy-winning "Succession" star voices Satan in the show's special Halloween episode, "Happy Hell-o-Ween," airing Oct. 5 on Hulu. And according to the show's co-showrunners, Culkin has already staked a long-term claim on the part.

"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.

"Happy Hell-o-Ween" opens on Stewie and Brian, dressed to the nines and desperate to attend a star-studded Halloween party on Block Island, reachable only by ferry. As the party ferry is about to leave, they spot a man drowning in the water and weigh whether to save him or make it to the soiree — a party Stewie is especially eager to reach because he has heard the actor Eddie Redmayne may be there.

"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," Appel explains. "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 choose the party, only to be killed shortly afterward and sent to waiting-room purgatory, where they rub shoulders with a Boy Scout leader and Larry Nassar. Expecting the heavenly afterlife, they instead land in the office of the Devil, voiced by Culkin, who appears overwhelmed by his job.

The show's version of Hell includes the actress Jamie Lee Curtis being tortured — she is there because she is "getting a bit much" — and a famously kind ex-president. Appel says the fun lay in placing people audiences would never 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."

The production pipeline rules out topical jokes. Appel says every episode, from table read to final cut, takes about 14 months, with a 60-piece orchestra performing for each one. "We can't be a 'Tonight Show' monologue because we can't produce it that fast," he says.

Money was not the draw for Culkin either. "We happily discovered that [Culkin] is a fan of the show and he enthusiastically embraced it," Appel says. "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" and says he was struck by how much Culkin resembled his "Succession" character, Roman Roy, in the booth.

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

With the showrunners committed to his return, Culkin's Devil looks set to become a recurring fixture in Quahog's underworld.