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William Hartnell as The Doctor |
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Peter Purves as Steven Taylor |
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Jackie Lane as Dodo Chaplet |
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Eric Elliott as Commander |
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Inigo Jackson as Zentos |
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Roy Spencer as Manyak |
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Michael Sheard as Rhos |
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Kate Newman as Mellium |
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Ian Frost as Baccu |
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Stephanie Heesom as Guardian |
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Paul Greenhalgh as Guardian |
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Edmund Coulter as Monoid |
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Frank George as Monoid |
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Ralph Carrigan as Monoid |
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John Caesar as Monoid |
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Roy Skelton as Monoid Voice |
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John Halstead as Monoid Voice |
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Terence Woodfeld as Maharis |
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Brian Wright as Dassuk |
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Eileen Helsby as Venussa |
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Terence Bayler as Yendom |
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Richard Beale as Refusian Voice |
| Writing | Paul Erickson | Writer |
| Directing | Michael Imison | Director |
| Writing | Lesley Scott | Writer |
| Writing | Gerry Davis | Script Editor |
| Sound | Tristram Cary | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
| Production | David Maloney | Production Assistant |
| Crew | Brian Hodgson | Special Sound Effects |
| Costume & Make-Up | Daphne Dare | Costume Design |
| Art | Barry Newbery | Production Design |
| Camera | Tony Leggo | Camera Operator |
| Editing | Noel Chanan | Editor |
| Costume & Make-Up | Sonia Markham | Makeup Artist |
| Lighting | Howard King | Lighting Director |
| Sound | Ray Angel | Sound |
| Production | John Wiles | Producer |
