Michael Chernus stars as Gacy in the film.
Also featured in the cast are Gabriel Luna, Michael Aragano, Chris Sullivan, Marin Ireland, and James Badge Dale.
https://decider.com/2025/10/16/devil-in-disguise-john-wayne-gacy-peacock-review/
Stream It Or Skip It: ‘Devil In Disguise: John Wayne Gacy’ On Peacock, Where The Notorious Serial Killer’s Life Is Examined, As Are The Lives Of His Victims
DEVIL IN DISGUISE: JOHN WAYNE GACY -- -- Pictured: Michael Chernus as John Wayne Gacy -- (Photo by: Brooke Palmer/PEACOCK)