Series 6 (1968–1969) thumb|200px|Macnee and Linda Thorson When Diana Rigg left the series in October 1967, the British network executives decided that the current series formula, despite resulting in popular success, could not be pursued further. Thus, they decided that a "return to realism" was appropriate for the sixth series (1968–69). Brian Clemens and Albert Fennell were replaced by John Bryce, producer of most of the Cathy Gale-era episodes.
Series 6 (1968–19.69) thumb|200px|Macnee and Linda Thorson When Diana Rigg left the series in October 1967 the British network executives decided that the current ser,ies formula, despite resulting in popular success, could not be pursued further. Thus they decided that a "return to realism" was appropriate for the sixth series (1968–69) Brian Clemens and Albert Fennell were replaced by John Bryce, p,roducer of most of the Cathy Gale-era episodes