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| Cast |
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| Dr Spencer Quist | PAUL, John |
| Colin Bradley | BLANSHARD, Joby |
| Dr John Ridge | OATES, Simon |
| Tobias Wren | POWELL, Robert |
| The Minister | BARRON, John |
| Pat Hunnisett | HALL, Wendy |
| Commander Neil Stafford | BOWN, John |
| Barbara Mason | SHERRARD, Vivien |
| Dr Anne Tarrant | WEAVER, Elizabeth |
| Vincent Llewellyn | YOUNG, Jeremy |
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| Credits |
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| Production Company | BBC |
| Series devised by | PEDLER, Kit |
| | DAVIS, Gerry |
| Producer | DUDLEY, Terence |
| Script Editor | DAVIS, Gerry |
| Script Consultant | KALISKI, Anna |
| Scripts | CURTEIS, Ian |
| | DAVIS, Gerry |
| | DOUGLAS, Stewart |
| | DUDLEY, Terence |
| | GREEN, Harry |
| | HAYLES, Brian |
| | JONES, Elwyn |
| | MARKS, Louis |
| | PEDLER, Kit |
| | SHAW, Don |
| | SPOONER, Dennis |
| | WORTH, Martin |
| Directors | ALWYN, Jonathan |
| | BLAKE, Darrol |
| | CIAPPESSONI, Paul |
| | DUDLEY, Terence |
| | LAWRENCE, Quentin |
| | PROUDFOOT, David |
| | ROBERTS, Pennant |
| Designers | BAYLDON, Oliver |
| | DAVIES, Jeremy |
| | HURST, John |
| | LONDON, Ray |
| | NEWBERY, Barry |
| | TAIT, Moira |
| | WALKER, Stuart |
| | WATSON, Ian |
| Graphics | JEAPES, Alan |
| Lighting | TREAYS, John |
| Costumes | WALLACE, Dorothea |
| Make-up | ROWELL, Elizabeth |
| Music | HARRIS, Max |
| Sound | GOODSON, Larry |
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