Cast & crew
The Breakthrough (1975)
Directed by Graham Evans Written by Clive Exton
Cast
| Roy Boyd | Jason |
| John Westbrook | Charon |
| Anthony Nicholls | Sir Te |
| Maryann Turner | Jason |
| Rosalind McCabe | Niki |
| Brewster Mason | Rev. Maclean |
| Simon Ward | Constable Saunders |
| Thomas Ellice | Ken |
| Clive Swift | Robbie Avery |
Crew
| Tony Abbott | Set Designer |
| Simon Channing Williams | Production Assistant |
| Daphne du Maurier | Original Story |
| Judy Allen | Costumer |
| Graham Evans | Director |
| Colin Dixon | Sound |
| Anita Pickles | Makeup Artist |
| Clive Exton | Screenplay |
| Peter Sargent | Camera Operator |
| Geoff Shaw | Lighting Artist |
| Irene Shubik | Producer |
| Ken Pearce | Editor |
| Bill Wild | Sound |