| Barry Evans | as | Michael Upton | |
| George Layton | as | Paul Collier | |
| Geoffrey Davies | as | Dick Stuart-Clark | |
| Richard O'Sullivan | as | Lawrence Bingham | |
| Ernest Clark | as | Professor Geoffrey Loftus | |
| Fabia Drake | as | Dr. Whiteland | |
| Arthur Lowe | as | Dr. Maxwell | |
| Brian Oulton | as | Dr. Griffin | |
| Madeline Smith | as | Sue Maxwell |
Series: 1
Episodes: 29
Transmitted: 1971
Channel: ITV
London Weekend Television