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Ricardo Montalban as Dr. Luis Delgado |
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José Ferrer as Dr. Alfred Vreeland |
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Leslie Nielsen as Official |
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Chris Robinson as Ledring |
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Katherine Woodville as Barbara Brand |
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Lawrence P. Casey as Bob Exeter |
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Tom Simcox as Jerry Hollis |
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Curt Lowens as Ehrlich |
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Austin Stoker as Bogan |
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Phil Philbin as First Technician |
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Dan Chandler as Sonar Man |
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Ted Swanson as Aide |
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Myron Natwick as First Reporter |
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Harlan Warde as Second Reporter |
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Elisa Ingram as Jean Hollis |
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Joan Murphy as Norma |
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William Evenson as Jim Morgan |
| Editing | Erwin Dumbrille | Editor |
| Costume & Make-Up | Dyke Davis | Costume Design |
| Camera | Jordan Klein Sr. | Camera Operator |
| Sound | Lalo Schifrin | Music |
| Sound | Jeff Bushelman | Sound Editor |
| Production | Ivan Tors | Producer |
| Sound | Gordon Zahler | Music Director |
| Camera | Ricou Browning | Other |
| Crew | Clifford H. Poland Jr. | Cinematography |
| Writing | Ivan Tors | Story |
| Art | Eugene Harris | Art Direction |
| Writing | Winston Miller | Writer |
| Directing | Don McDougall | Director |
| Writing | Leslie Stevens | Writer |
| Writing | Alan Caillou | Story |
