 | Tom Baker als The Doctor |
 | Lalla Ward als Romana |
 | David Brierly als K-9 (voice) |
 | Christopher Neame als Skagra |
 | Daniel Hill als Chris Parsons |
 | Denis Carey als Professor Chronotis |
 | Victoria Burgoyne als Clare Keightley |
 | Gerald Campion als Wilkin |
 | Shirley Dixon als The Ship (voice) |
| Derek Pollitt als Dr. Caldera |
| James Coombes als The Krargs (voice) |
| John Hallet als Police Constable |
| David Strong als Passenger |
| James Muir als Fisherman |
| Derek Suthern als Krarg |
 | Barnaby Edwards als Krarg |
 | Tim Bentinck als The Doctor (body double) |
| Toby Hadoke als Continuity Announcer (voice) |
| Mark Ayres | Music |
| Joan Stribling | Makeup Designer |
| Graham Williams | Producer |
| Tariq Anwar | Editor |
| Pennant Roberts | Director |
| Alec Wheal | Camera Supervisor |
| Mike Tucker | Modeling |
| Douglas Adams | Writer |
| Joan Stribling | Hair Designer |
| Douglas Adams | Script Editor |
| Peter Tyler | Director of Photography |
| Keff McCulloch | Original Music Composer |
| Dudley Simpson | Original Music Composer |
| John Nathan-Turner | Producer |
| Ralph Wilton | Production Assistant |
| Mark Ayres | Sound |
| Brian Hodgson | Special Sound Effects |
| Dick Mills | Special Sound Effects |
| Ron Blight | Sound |
| John Hartshorn | Sound |
| Michael McCarthy | Sound |
| Fintan Sheehan | Camera Operator |
| Colin Case | Camera Operator |
| Alan Graham | Gaffer |
| Dave Scrivens | Gaffer |
| Sean Sweetman | Grip |
| Dicky Howett | Camera Supervisor |
| Mike Jefferies | Lighting Director |
| Martin Kempton | Lighting Director |
| AnneMarie Walsh | Lead Animator |
| Rob Ritchie | 3D Animator |
| Rob Ritchie | Compositor |
| Adrian Salmon | Storyboard Artist |
| Ana García Sebastiá | Animation |
| Joanna Hepworth | Animation |
| Barry Evans | Animation |
| Shaun Askew | Animation |
| David Busch | Animation |
| Robin Brindle | Animation |
| Linda Kalcov | Animation |
| Andy Gubba | Animation |
| Chris Bowles | Animation |
| Barry Baker | Animation |
| Jane Davies | Animation |
| Kate Sullivan | Animation |
| Mike Collins | Storyboard Artist |
| Jez Hall | Storyboard Artist |
| Dave Havard | Visual Effects Designer |
| Dave Chapman | Visual Effects |
| Victor Meredith | Production Design |
| Helen MacKenzie | Property Buyer |
| Rupert Roxburghe-Jarvis | Costume Design |
| Kim Burns | Makeup Artist |
| Sinikka Ikaheimo | Makeup Artist |
| Joan Stribling | Makeup Artist |
| Charles Norton | Director |
| Charles Norton | Producer |
| James Goss | Producer |
