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