Columns: Episode no. | Title | Director | Writer(s) | Original Air Date (ATV) | Production no.
1 | " A Case for the Bishop " | Alan Perry | Gerry and Sylvia Anderson | 21 September 1969 | 1 | 2 | " A Question of Miracles " | Leo Eaton | Donald James | 28 September 1969 | 2 | 3 | " To Catch A Spy " | Brian Heard | Pat Dunlop | 5 October 1969 | 4 | 4 | "The Feathered Spies" | Ian Spurrier | Tony Barwick | 12 October 1969 | 3 | 5 | "Last Train to Bufflers Halt" | Alan Perry | Tony Barwick | 19 October 1969 | 5 | 6 | "Hole in One" | Brian Heard | Shane Rimmer | 26 October 1969 | 8 | 7 | "Recall to Service" | Peter Anderson | Pat Dunlop | 2 November 1969 | 7 | 8 | "Errand of Mercy" | Leo Eaton | Tony Barwick | 9 November 1969 | 6 | 9 | "The Deadly Whisper" | Leo Eaton | Donald James | 16 November 1969 | 11 | 10 | "The Cure" | Leo Eaton | Pat Dunlop | 23 November 1969 | 10 | 11 | "School for Spies" | Ken Turner | Donald James | 30 November 1969 | 9 | 12 | "May-Day, May-Day!" | Alan Perry | Bob Kesten | 7 December 1969 | 12