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George Segal as Dan |
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Ursula Andress as Erica Kramer |
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Orson Welles as Plankett |
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Ian Hendry as Karl |
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Johnny Sekka as Matakit |
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Michel Constantin as Jose |
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Georges Géret as Andre |
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Sylvain Lévignac as Louis |
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Charles Lamb as Todd |
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Guy Delorme as Michael |
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Harry Andrews as Kramer |
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Jacques Van Dooren as Man in Bar (uncredited) |
| Writing | Jules Verne | Novel |
| Writing | Jack Seddon | Screenplay |
| Directing | Sidney Hayers | Director |
| Writing | David Pursall | Screenplay |
| Sound | Kenneth Heeley-Ray | Sound Editor |
| Costume & Make-Up | Jimmy Garfath | Makeup Artist |
| Art | Pierre-Louis Thévenet | Set Designer |
| Costume & Make-Up | Hugh Richards | Makeup Artist |
| Editing | Glenn Hyde | Assistant Editor |
| Costume & Make-Up | Maude Onslow | Hairdresser |
| Editing | Tristam Cones | Editor |
| Sound | Georges Garvarentz | Original Music Composer |
| Camera | Raoul Coutard | Director of Photography |
