 | Jacques Bergerac als Desmond |
 | Merry Anders als Dodie Wilson |
 | Marcia Henderson als Marcia Blaine |
 | Allison Hayes als Justine |
 | Joe Patridge als Det. Sgt. Dave Kennedy |
| Fred Demara als The Great Impostor |
| Lawrence Lipton als Beatnik Poet Laureate |
| Eric Nord als King of the Beatniks (as Eric 'Big Daddy' Nord) |
 | Guy Prescott als Dr. Philip Hecht |
 | Jimmy Lydon als Emergency Doctor (as James Lydon) |
 | Carol Thurston als Doris Scott |
| Eva Lynd als Woman from Audience |
| Don Ames als Audience Member (uncredited) |
 | Eddie Baker als Observer at Scene (uncredited) |
| Nina Borget als Audience Member (uncredited) |
| Phyllis Cole als Mrs. McNear (uncredited) |
 | Franklyn Farnum als Audience Member (uncredited) |
| Mary Foran als June Mayes (uncredited) |
| George Ford als Audience Member (uncredited) |
| Holly Harris als Mrs. Stevens (uncredited) |
 | Kenner G. Kemp als Audience Member (uncredited) |
| Evan MacNeil als Victim (uncredited) |
 | Monty O'Grady als Audience Member (uncredited) |
| Al Roberts als Audience Member (uncredited) |
| Cosmo Sardo als Theatre Greeter (uncredited) |
| Gitta Woodfield | Screenplay |
| George Blair | Director |
| William Read Woodfield | Screenplay |
| William Austin | Editor |
| Marlin Skiles | Original Music Composer |
| Emile LaVigne | Makeup Artist |
| Milton Olsen | Special Effects |
| Ben Schwalb | Executive Producer |
| Dave Milton | Art Direction |
| Charles B. Bloch | Producer |
| Frank Wade | Set Decoration |
| Archie R. Dalzell | Cinematography |
| Tony Lloyd | Makeup Artist |
| Edward Morey Jr. | Production Manager |
| Ray Gosnell Jr. | Assistant Director |
| Arden Cripe | Property Master |
| James West | Construction Manager |
| Ralph Butler | Recording Supervision |
| Martin Greco | Sound Editor |
| Roger J. Weinberg | Wardrobe Master |
| Eve Newman | Music Editor |
| Virginia Barth | Continuity |
| Gil Boyne | Technical Advisor |
