| William Hartnell | ... | Dr. Who | |
| Peter Purves | ... | Steven | |
| Jackie Lane | ... | Dodo | |
| rest of cast listed alphabetically: | |||
| Edmund Coulter | ... | 1st Monoid | |
| Eric Elliott | ... | Commander | |
| Ian Frost | ... | Baccu | |
| Frank George | ... | 2nd Monoid | |
| Paul Greenhalgh | ... | 2nd Guardian | |
| Stephanie Heesom | ... | 1st Guardian | |
| Inigo Jackson | ... | Zentos | |
| Kate Newman | ... | Mellium | |
| Michael Sheard | ... | Rhos | |
| Roy Spencer | ... | Manyak | |
| Mark Allington | ... | Guardian (uncredited) | |
| Bernard Barnsley | ... | Monoid (uncredited) | |
| Eric Blackburn | ... | Monoid (uncredited) | |
| Raymond Byron | ... | Guardian (uncredited) | |
| Terry Cashfield | ... | Guardian (uncredited) | |
| Diana Chapman | ... | Guardian (uncredited) | |
| Roy Douglas | ... | Guardian (uncredited) | |
| Jackie Duval | ... | Guardian (uncredited) | |
| George Gibbs | ... | Guardian (uncredited) | |
| Hazel Graham | ... | Guardian (uncredited) | |
| Ron Gregory | ... | Guardian (uncredited) | |
| Trevor Griffiths | ... | Guardian (uncredited) | |
| Philip Harris | ... | Guardian (uncredited) | |
| Bill Hunter | ... | Guardian (uncredited) | |
| Paul Johnson | ... | Guardian (uncredited) | |
| Tony Kemp | ... | Guardian (uncredited) | |
| Jacqueline Lewis | ... | Guardian (uncredited) | |
| Sheelagh McGrath | ... | Guardian (uncredited) | |
| Jackie Salt | ... | Guardian (uncredited) | |
| Chris Webb | ... | Monoid (uncredited) | |
| Judith Webb | ... | Guardian (uncredited) | |
| Jan Williams | ... | Guardian (uncredited) | |
| Episode Crew |
Directed by | |||
| Michael Imison | |||
Writing credits | ||
| Paul Erickson | (writer) & | |
| Lesley Scott | (writer) | |
Produced by | |||
| John Wiles | .... | producer | |
Original Music by | |||
| Tristram Cary | |||
Production Design by | |||
| Barry Newbery | |||
Music Department | |||
| Ron Grainer | .... | composer: title music | |
Other crew | |||
| Gerry Davis | .... | story editor | |
| Series Crew These people are regular crew members. Were they in this episode? |
Writing credits | ||
| Sydney Newman | (creator) uncredited | |
Produced by | |||
| Peter Bryant | .... | associate producer (1966) | |
Film Editing by | |||
| John Dunstan | |||
| Glenn Hyde | |||
| Ian McKendrick | |||
| Dan Rae | |||
| Sheila S. Tomlinson | |||
Costume Design by | |||
| James Acheson | (1973-1976) | ||
| Nicholas Bullen | |||
| Richard Croft | |||
| Anushia Nieradzik | |||
| Dee Robson | |||
Makeup Department | |||
| Dorka Nieradzik | .... | makeup designer (1982, 1984-1988) | |
Art Department | |||
| Peter Brachaki | .... | production designer: TARDIS interior | |
Sound Department | |||
| John Tellick | .... | sound | |
Special Effects by | |||
| Mat Irvine | .... | special effects (1970s-1980s) | |
| Ian Scoones | .... | special effects (1960s-1980s) | |
| Ron Thornton | .... | special effects (1980s) | |
| Bernard Wilkie | .... | special effects (1960s-1970s) | |
Visual Effects by | |||
| Mitch Mitchell | .... | special video effects (1960's-1970's) (as A. J. Mitchell) | |
| Oliver Elmes | .... | title sequence designer (1987-1989) (uncredited) | |
| Bernard Lodge | .... | title sequence designer (1963-1979) (uncredited 1963-1969) | |
| Sid Sutton | .... | title sequence designer (1980-1986) (uncredited) | |
Stunts | |||
| Alan Chuntz | .... | stunts (1960's-1970's) | |
| Peter Diamond | .... | stunts (1960s) | |
| Max Faulkner | .... | stunts (1960's-1970's) | |
| Stuart Fell | .... | stunts (1970s-1980s) | |
| Alf Joint | .... | stunts (1960s-1980s) | |
| Derek Martin | .... | stunts (1960s-1970s) | |
| Roy Scammell | .... | stunts (1960s-1980s) | |
| Lee Sheward | .... | stunt coordinator | |
| Terry Walsh | .... | stunts (1960s-1970s) | |
| Derek Ware | .... | stunts (1960s-1970s) | |
Camera and Electrical Department | |||
| Stewart A. Farnell | .... | camera operator (1 episode) | |
| Peter Hamilton | .... | camera operator (12 episodes) | |
| Alan Jonas | .... | camera operator (6 episodes) | |
| Reg Poulter | .... | senior camera operator | |
| Robert Sleigh | .... | camera operator (pilot episode) | |
| Ken Westbury | .... | camera operator (4 episodes) | |
Music Department | |||
| Mark Ayres | .... | composer: incidental music (1988-1989) | |
| Carey Blyton | .... | composer: incidental music (1970-1973) | |
| Paddy Kingsland | .... | composer: incidental music (1980-1985) | |
| Keff McCulloch | .... | composer: incidental music (1987-1989) | |
| Humphrey Searle | .... | composer: incidental music (1965) | |
| Dudley Simpson | .... | composer: incidental music (1964-1980) | |
Other crew | |||
| Christopher Baker | .... | production assistant | |
| Ali Bongo | .... | magic advisor | |
| Terry Brett | .... | technical manager | |
| Kenneth J. Bussanmas | .... | creative consultant (1979-1985) | |
| Patricia Greenland | .... | production assistant | |
| Jeremy Hare | .... | assistant floor manager (three episodes) | |
| Main series | Episode guide | Full cast and crew |
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