 |
Cast |  |
|
| The Doctor | William Hartnell | ||
| Steven Taylor | Peter Purves | ||
| Dodo Chaplet | Jackie Lane | ||
| Commander | Eric Elliott | ||
| Zentos | Inigo Jackson | ||
| Rhos | Michael Sheard | ||
| Manyak | Roy Spencer | ||
| Mellium | Kate Newman | ||
| Baccu | Ian Frost | ||
| Monoids | Edmund Coulter | ||
| Frank George | |||
| Monoid Two | Ralph Carrigan | ||
| Yendom | Terence Bayler | ||
| Monoid One | Edmund Coulter | ||
| Monoid Three | Frank George | ||
| Monoid Four | John Caesar | ||
| Monoid Voices | John Halstead | ||
| Roy Skelton | |||
| Guardians | Stephanie Heesom | ||
| Paul Greenhalgh | |||
| Maharis | Terence Woodfield | ||
| Dassuk | Brian Wright | ||
| Venussa | Eileen Helsby | ||
| Refusian Voice | Richard Beale | ||
| Crew | |||
| Written By | Paul Erickson | ||
| Lesley Scott | |||
| Music | Tristam Cary | ||
| Make-up | Sonia Markham | ||
| Costumes | Daphne Dare | ||
| Designer | Barry Newbery | ||
| Script Editor | Gerry Davis | ||
| Producer | John Wiles | ||
| Director | Michael Imison | ||
| Transmission Details | |||
| Episode | Episode Name | Original UK Transmission Date | Duration |
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
