 | Richard Dreyfuss als Boy Wonder |
 | Jessica Harper als Cathy Cake |
 | Bob Hoskins als Big Mac |
 | Veronica Cartwright als Harlene |
 | Stephen Davies als Rex, the Wonder Dog |
| John Byrum | Director |
| Denys N. Coop | Director of Photography |
| Davina Belling | Producer |
| Miriam Brickman | Casting |
| Clive Parsons | Producer |
| Josie MacAvin | Set Decoration |
| Shirley Russell | Costume Design |
| John Clark | Art Direction |
| Michael Bradsell | Editor |
| Harry Benn | Associate Producer |
| Robin Grantham | Makeup Artist |
| Patricia McDermott | Hairstylist |
| Jessica Harper | Music Consultant |
| David Wynn-Jones | Focus Puller |
| John Byrum | Screenplay |
| Mike Higgins | Second Assistant Director |
| Barry Langley | Assistant Director |
| John Allenby | Property Master |
| Terry Apsey | Construction Manager |
| Reg Wheeler | Property Master |
| Derek Ball | Sound Mixer |
| Ken Nightingall | Boom Operator |
| Ian Fuller | Sound Editor |
| Bill Rowe | Sound Mixer |
| John Harris | Camera Operator |
| Zelda Barron | Continuity |
| Richard Pointing | Wardrobe Supervisor |
| Ray Hall | Grip |
| Colin Berwick | Assistant Editor |
| Laurie Shane | Gaffer |
| Edna Tromans | Unit Publicist |
| Bobby Blues | Production Accountant |
