Matt McColm
— Ken Conway
Annabel Schofield
— Marisa
Ron Perlman
— Dr. Ramsey Krago
Carol Alt
— Agent Monica McBride
Morgan Brittany
— Sloane Matthews
Clint Howard
— Hutch
John Rhys-Davies
— Rasheed
Michael Paul Chan
— Dr. Anthony Mane
Gary Kasper
— Billy
Jack Gill
— Dr. Stanley Erhardt
Terrence Stone
— Myles Vale
Bonnie Paul
— Receptionist
Mike Justus
— Security Guard
Danny Epper
— Laboratory Guard
Kane Hodder
— Guard Falling Down Stairs (uncredited)