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| Cast |
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| Edward Woodward | David Callan |
| Anthony Valentine | Toby Meres |
| Patrick Mower | Cross |
| Russell Hunter | Lonely |
| Lisa Langdon | Liz, Hunter's secretary |
| Ronald Radd | Hunter |
| Michael Goodliffe | Hunter |
| Derek Bond | Hunter |
| William Squire | Hunter |
| Clifford Ross | Snell |
| John Wentworth | Sir Michael Harvey |
| Jeffrey Chater | Bishop |
| T.P. McKenna | Richmond |
| Paul Williamson | Stafford |
| Peter Bowles (pilot only) | Toby Meres |
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| Credits |
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| ABC/Thames TV for ITV, 1967-72; 1981 |
| 43 x 50 minute episodes + 1 special, black & white/colour |
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| Directors include | Peter Duguid |
| | James Goddard |
| | Mike Vardy |
| | Bill Bain |
| | Piers Haggard |
| | Robert Tronson |
| Writers include | James Mitchell |
| | Robert Banks Stewart |
| | Ray Jenkins |
| | Bill Craig |
| | Trevor Preston |
| | George Markstein |
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