Ludo French stars in a sci-fi series, but working with the arrogant, conceited, always dissatisfied man pushes the production to its limits.
| Actor | Role |
|---|---|
 Alfred MarksCaptain Katt/Ludovic French/Inspector Brough | Captain Katt/Ludovic French/Inspector Brough |
 Derek RoyleThe Professor/Frank Lucas | The Professor/Frank Lucas |
| JJanet BehanLieutenant Rook/Louise Jobling | Lieutenant Rook/Louise Jobling |
 Simon RouseDesmond Gibb | Desmond Gibb |
| SSarah JamesPat | Pat |
 Clare CliffordMargot | Margot |
| HHoward SamuelsToby | Toby |
| JJohn ElmesDave | Dave |
 Patricia MaynardMadeleine Forsyth | Madeleine Forsyth |
| IIan FairbairnTed | Ted |
 John OwensJoe | Joe |
| RRos SimmonsMugwump/Sylvia Pym | Mugwump/Sylvia Pym |
 David HattonJack Judge | Jack Judge |