John Karyus
— John Wayne Gacy
Lloyd Kaufman
— Papa Gacy
Eileen Dietz
— Angry Lady
Steve Hansen
— Narrator
Caleb Emerson
— Peter Nooch Sr.
John R. Walker
— Officer Cordell
Josh Cornell
— Brian Thomson
Matt Osborn
— Prosecutor
Kayla Bushell
— Marylin Myers
Tyler Dolph
— Officer Woodrow
Ryan Freeman
— Pete
Klaus Freeman
— Soda Pop Boy