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Denholm Elliott as Jack Black |
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Billie Whitelaw as Judy Black |
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Richard Vernon as Dr Whitman |
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Bernard Hepton as Colin Sands |
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Dennis Waterman as Dr Bilson |
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Michele Dotrice as Veronica Sands |
| Writing | Dennis Potter | Writer |
| Directing | Alan Bridges | Director |
| Production | Roderick Graham | Producer |
