 | Donald Pleasence als Professor Nolter |
 | Tom Baker als Lynch |
 | Brad Harris als Brian Redford |
 | Julie Ege als Hedi |
 | Michael Dunn als Burns |
 | Scott Antony als Tony |
 | Jill Haworth als Lauren |
 | Olga Anthony als Bridget |
 | Eithne Dunne als Nurse |
 | Lisa Collings als Prostitute |
 | Joan Scott als Landlady |
| Toby Lennon als Tramp |
 | Richard Davies als Doctor |
| John Wireford als Policeman |
| Tony Mayne als Dwarf Tony |
| Molly Tweedlie als Dwarf Molly |
| Kathy Kitchen als Midget Kathy |
 | Fran Fullenwider als Fat lady |
| Lesley Roose als Skinny Lady |
| Fay Bura als Bearded Lady |
| Bob Bura als Fire Eater |
| Orla Pederson als Human Pincushion |
| Madge Garnett als Monkey Woman |
| Willie Ingram als Popeye |
| Esther Blackmon als Alligator Girl |
| Hugh Baily als Pretzel Boy |
| Félix Duarte als Frog Boy |
 | Jill Goldston als Girl at Carnival Freakshow (uncredited) |
| Jack Cardiff | Director |
| Robert D. Weinbach | Screenplay |
| Ray Freeborn | Second Assistant Director |
| Charles E. Parker | Special Effects Makeup Artist |
| Paul Beeson | Director of Photography |
| Brad Harris | Associate Producer |
| Sally Nicholl | Casting |
| Josie MacAvin | Set Decoration |
| Herbert G. Luft | Associate Producer |
| John Trumper | Editor |
| Edward Mann | Screenplay |
| Herbert Smith | Art Direction |
| Robert D. Weinbach | Producer |
| Basil Kirchin | Original Music Composer |
| J. Ronald Getty | Executive Producer |
| Susie Hill | Hairdresser |
| Jack Smith | Production Supervisor |
| Alfred W. Marcus | Production Manager |
| Brian Dunbar | Assistant Director |
| Gareth Tandy | Third Assistant Director |
| Mike Le Mare | Sound Editor |
| Peter Bond | Assistant Sound Editor |
| Russ Woolnough | First Assistant Editor |
| David Beesley | Assistant Editor |
| Ted Karnon | Sound Mixer |
| Brian Ford | Sound Mixer |
| Ray Sturgess | Camera Operator |
| Danny Daniel | Sound Recordist |
| Stan Haines | Boom Operator |
| David Worley | Focus Puller |
| Doreen Soan | Continuity |
| Eddie Powell | Stunts |
| Paul Vachon | Wardrobe Master |
| John Lageu | Assistant Art Director |
| Josie MacAvin | Set Dresser |
| John Jay | Still Photographer |
| Ray Tranter | Production Accountant |
| Mike Hope | Special Effects |
| Joanna Wright | Wardrobe Assistant |
| Kay Freeborn | Assistant Makeup Artist |
| Robin Grantham | Assistant Makeup Artist |
| Bob Devine | Construction Manager |
| John May | Electrician |
| Lynda Levy | Production Secretary |
| Jeanne Ferber | Production Secretary |
