Trailer
 | Olivia Hussey as Dr. Karen Murphy |
 | William Atherton as Dr. Ira Gold |
 | Sean Young as Mother |
 | Christopher Denham as Alex Borden |
 | Dee Wallace as Dr. Denise Bell |
 | Udo Kier as Rev. Karl Hartman |
 | Mark Margolis as Boris Pavlovsky |
 | Larry Fessenden as Father |
 | Erick Kastel as Harry Jellenik |
 | Pollyanna McIntosh as Stacy |
 | Paul Sparks as Jason |
 | Daniel Manche as Young Harry |
| James Spruill as Lloyd |
 | Patrick Wang as Sammy |
 | India Eisley as Martha |
| Karen Anderson as Desk Nurse |
| Jeanette Arnone as Mother (KGB Lab) |
 | David Austin as Female Creature |
| Matthew Biancaniello as Creature |
 | Teodorina Bello as Hospital Cleaning Lady |
| Richard Blauvelt as Slattery, Guard #2 |
| Stephen Benson as Social Worker |
| Dr. R.D. Bowers as Doctor #1 |
| Paul Boritzer as Police Officer #1 |
| Agata Bowman as Wheel Chair Patient |
 | Elwaldo Baptiste as Highwater, Guard #1 |
 | Mercedes López Renard as Reporter Connie Sanchez |
| Production | |
| Andrew van den Houten | Producer |
| Marius Kerdel | Executive Producer |
Costume & Make-Up | |
| Michael Bevins | Costume Design |
Directing | |
| Andrew van den Houten | Director |
Art | |
| Jeff Subik | Production Design |
Editing | |
| Elwaldo Baptiste | Editor |
Production | |
| Robert Tonino | Line Producer |
Writing | |
| William M. Miller | Author |
Sound | |
| Ryan Shore | Original Music Composer |
Costume & Make-Up | |
| Aimee Schlectman | Costume Design |
Production | |
| William M. Miller | Producer |
Art | |
| Krista Gall | Production Design |
Writing | |
| Steve Klausner | Author |
Production | |
| Cindi Rush | Casting |
Camera | |
| William M. Miller | Director of Photography |
Writing | |
| Troy McCombs | Author |
Production | |
| Abe Shainberg | Associate Producer |
| Elwaldo Baptiste | Associate Producer |
| William Atherton | Co-Producer |
