Directed by
| Jack Arnold | ||
Writing Credits
| David Duncan | ... | (written by) |
Cast (in credits order) verified as complete
| Arthur Franz | ... | Professor Donald Blake | |
| Joanna Moore | ... | Madeline Howard | |
| Judson Pratt | ... | Police Lt. Mike Stevens | |
| Nancy Walters | ... | Sylvia Lockwood | |
| Troy Donahue | ... | Jimmy Flanders | |
| Phil Harvey | ... | Police Sgt. Powell | |
| Helen Westcott | ... | Nurse Molly Riordan | |
 |
Alexander Lockwood | ... | Professor Gilbert Howard |
| Whit Bissell | ... | Dr. Oliver Cole | |
| Ross Elliott | ... | Police Sgt. Eddie Daniels | |
| Rest of cast listed alphabetically: | |||
|
|
Anne Anderson | ... | Student (uncredited) |
| Louis Cavalier | ... | Student (uncredited) | |
| Richard H. Cutting | ... | Tom Edwards - Forest Ranger (uncredited) | |
| Eddie Parker | ... | Donald as a Monster (uncredited) | |
| Hank Patterson | ... | Townsend - Night Watchman (uncredited) | |
| Ronnie Rondell Jr. | ... | Student (uncredited) | |
Produced by
| Joseph Gershenson | ... | producer |
Cinematography by
| Russell Metty | ... | director of photography |
Editing by
| Ted J. Kent | ||
Art Direction by
| Alexander Golitzen | ||
Set Decoration by
| Russell A. Gausman | ||
| Julia Heron | ||
Makeup Department
| Bud Westmore | ... | makeup artist |
| Jack Kevan | ... | creature designer (uncredited) |
Second Unit Director or Assistant Director
| Marshall Green | ... | assistant director |
Sound Department
| Leslie I. Carey | ... | sound |
| Joe Lapis | ... | sound |
Camera and Electrical Department
| Clifford Stine | ... | special photography |
Costume and Wardrobe Department
| Bill Thomas | ... | gowns |
Music Department
| Paul Dessau | ... | composer: stock music (uncredited) |
| Irving Gertz | ... | composer: stock music (uncredited) |
| William Lava | ... | composer: stock music (uncredited) |
| Earl E. Lawrence | ... | composer: stock music (uncredited) |
| Henry Mancini | ... | composer: stock music (uncredited) |
| Heinz Roemheld | ... | composer: stock music (uncredited) |
| Ethmer Roten | ... | musician: flute (uncredited) |
| Hans J. Salter | ... | composer: stock music (uncredited) |
| Frank Skinner | ... | composer: stock music (uncredited) |
| Herman Stein | ... | composer: stock music (uncredited) |
Additional Crew
| Reynold Brown | ... | movie poster art (uncredited) |
