| Charles Chaplin (King Shahdov) | Maxine Audley (Queen Irene) | Jerry Desmonde (Prime Minister Voudel) |
| Oliver Johnston (Ambassador Jaume) | Dawn Addams (Ann Kay - TV Specialist) | Sid James (Johnson - TV Advertiser (as Sidney James)) |
| Joan Ingram (Mona Cromwell - Hostess) | Michael Chaplin (Rupert Macabee) | John McLaren (Macabee Senior) |
| Phil Brown (Headmaster) | Harry Green (Lawyer) | Robert Arden (Liftboy) |
| Alan Gifford (School Superintendent) | Robert Cawdron (Ulrich - U.S. Marshal) | George Woodbridge (Member of Atomic Commission) |
| Clifford Buckton (Member of Atomic Commission) | Vincent Lawson (Member of Atomic Commission) | Shani Wallis (Singer) |
| Joy Nichols (Singer) | Lauri Lupino Lane (Comedian) | George Truzzi (Comedian) |
| Tony Crombie (Nightclub drummer (non-crédité)) | Pat Gibson ((non-crédité)) | Wendy Graham ((non-crédité)) |
| Lilian Grassom (Cute Girl (non-crédité)) | Arthur Gross (Autograph hunter (non-crédité)) | Tubby Hayes (Nightclub saxophonist (non-crédité)) |
| Frazer Hines ((non-crédité)) | Roy Hines ((non-crédité)) | Penelope Horner ((non-crédité)) |
