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Margaret O'Brien as Alpha |
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James Craig as Mike Regan |
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Marsha Hunt as Katie Mallory |
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Philip Merivale as Professor Peter Vincent |
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Henry O'Neill as Professor Josh Pringle |
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Donald Meek as Professor Catty |
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Keenan Wynn as Packy Roost |
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Alan Napier as Dr. Woodring |
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Sara Haden as Rhoda Kitterick |
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Kathleen Lockhart as Mrs. Catty |
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Howard Freeman as Professor Richards |
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Walter Fenner as Professor Endicott |
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Elisabeth Risdon as Mrs. Pringle |
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Robert Blake as Jerry |
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Barbara Bedford as Telephone Operator (uncredited) |
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Ava Gardner as Hat Check Girl (uncredited) |
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Mike Mazurki as Fighter (uncredited) |
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Pauline Starke as Bobby's Mother (uncredited) |
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Eddie Acuff as Policeman (uncredited) |
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Hooper Atchley as Pepi (uncredited) |
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William Bishop as Reporter (uncredited) |
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Naomi Childers as Matron (uncredited) |
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Victor Sen Yung as Chinese Man (uncredited) |
| Writing | Isobel Lennart | Screenplay |
| Directing | Roy Rowland | Director |
| Costume & Make-Up | Irene | Costume Design |
| Writing | Angna Enters | Story |
| Art | Cedric Gibbons | Art Direction |
| Camera | Robert Surtees | Director of Photography |
| Directing | George Rhein | Assistant Director |
| Art | Edwin B. Willis | Set Decoration |
| Sound | Daniele Amfitheatrof | Original Music Composer |
| Editing | Frank E. Hull | Editor |
| Production | Robert Sisk | Producer |
| Writing | Angna Enters | Idea |
