| James Warwick | Michael Gaffikin |
| Celia Imrie | Fiona Patterson |
| Maurice Roëves | Inspector Inskip |
| Tom Watson | Dr. Goudry |
| Jonathan Newth | Colonel Howard |
| James Cosmo | Sergeant Carch |
| Fraser Wilson | P.C. Malcolmson |
| Tony Sibbald | Symonds |
| Elaine Wells | Mrs. Mackay |
| Dramatised by | Robert Holmes |
| From the Novel | Children of Vodyanoi by David Wiltshire |
| Production Managers | Graeme Harper, Carol Scott |
| Prodcution Associate | John Fabian |
| Production Assistant | Frances Graham |
| Assistant Floor Manager | David Tilley |
| Videotape Editor | Dave Hillier |
| Vision Mixer | Fred Law |
| Lighting | Clive Potter |
| Sound | Jeff Baker |
| Cameras | Alistair Mitchell, Neil Cameron |
| Visual Effects Designer | John Brace |
| Properties Buyer | Judy Ducker |
| Costumes | Ruper Jarvis |
| Make-Up | Frances Needham |
| Music Composed by | Robert Stewart |
| Script Editor | Jenny Sheridan |
| Designer | Allan Anson |
| Producer | Ron Craddock |
| Directed by | Douglas Camfield |
| ©BBC MCMXXXI | |
 |
1 May 1981 |
 | Episode Guide Compiled by Richard Spurr Posted: 3 August 2003 |  |