Trailer
Images
 | Robert Beatty as Dr. Mark Benton |
 | Elizabeth Sellars as Della Freeman |
 | Peter Coke as Det. Insp. George Bellamy |
 | Hugh Kelly as Dr. Craig |
 | Vida Hope as Jackie Leroy |
| Janet Butler as Sister Rogers |
 | Ferdy Mayne as Charles Constance |
 | James Raglan as Supt. Grayson |
 | Hugh Pryse as Mr. Rattray |
 | George Benson as Prescott |
 | Roger Delgado as Felix Galegos |
 | Frank Atkinson as Railway Ticket Clerk (uncredited) |
| Donald Conlon as Helios Restaurant Patron (uncredited) |
| Arthur Dibbs as Helios Restaurant Patron (uncredited) |
| Robert Gregory as Man at Northolt Airport (uncredited) |
| Jean Hardwicke as Sister (uncredited) |
| Barry Johns as Hospital Orderly (uncredited) |
| Anthony Lang as Johnny (uncredited) |
 | Ronald Leigh-Hunt as Sgt. Lewis (uncredited) |
| Richard Neller as Hospital Visitor (uncredited) |
| Harold Sanderson as Hospital Visitor (uncredited) |
| Marc Sheldon as Waiter (uncredited) |
 | Toke Townley as Fred Barker (uncredited) |
| Directing | |
| Martyn C. Webster | Director |
Writing | |
| A.R. Rawlinson | Screenplay |
| Francis Durbridge | Original Series Creator |
Camera | |
| Gerald Gibbs | Director of Photography |
Costume & Make-Up | |
| John O'Gorman | Makeup Artist |
Production | |
| Ernest G. Roy | Producer |
Sound | |
| Wilfred Burns | Music |
Production | |
| E.S. Laurie | Production Manager |
Art | |
| Bernard Robinson | Art Direction |
Directing | |
| Marjorie Owens | Continuity |
Editing | |
| Joseph Sterling | Editor |
Costume & Make-Up | |
| Betty Lee | Hairdresser |
Sound | |
| Harry Raynham | Sound |
| W. H. Lindop | Sound Recordist |
| Wilfred Burns | Conductor |
Camera | |
| Peter Lamb | Clapper Loader |
Costume & Make-Up | |
| Olive Swinney | Wardrobe Assistant |
Camera | |
| Noel Rowland | Camera Operator |
Directing | |
| Buddy Booth | Third Assistant Director |
| Pat Kelly | Assistant Director |
