Générique complet
Gacy
Mark Holton
John Wayne Gacy, Jr.
Adam Baldwin
John Gacy, Sr.
Charlie Weber
Tom Kovacs
Allison Lange
Gretchen
EJ
Edith Jefferson
Mother Gacy
Joleen Lutz
Kara Gacy
SH
Scott Allen Henry
Young John Gacy
Kenny Swartz
Dave
MF
Matt Farnsworth
Stu
Rick Dean
Ray
Glenn Morshower
Ted Boyle
John Laughlin
Det. Kay
