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Arthur Franz as Donald Blake |
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Joanna Moore as Madeline Howard |
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Judson Pratt as Lt. Mike Stevens |
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Troy Donahue as Jimmy Flanders |
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Nancy Walters as Sylvia Lockwood |
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Helen Westcott as Nurse Molly Riordan |
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Ross Elliott as Sgt. Eddie Daniels |
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Alexander Lockwood as Prof. Gilbert Howard |
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Whit Bissell as Dr. Oliver Cole |
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Richard H. Cutting as Tom Edwards - Forest Ranger |
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Hank Patterson as Townsend - Night Watchman |
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Phil Harvey as Sgt. Powell |
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Eddie Parker as Donald as a Monster |
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Ronnie Rondell Jr. as Student |
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Anne Anderson as Student |
| Directing | Jack Arnold | Director |
| Visual Effects | Jack Kevan | Creature Design |
| Production | Joseph Gershenson | Producer |
| Editing | Ted J. Kent | Editor |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Art | Alexander Golitzen | Art Direction |
| Camera | Russell Metty | Director of Photography |
| Writing | David Duncan | Writer |
| Visual Effects | Clifford Stine | Visual Effects |
