Written by Mervyn Haisman & Henry Lincoln, this storyline was considered around mid-1968. The story would be set in Scotland in Jamie's ancestral home, Castle McCrimmon, where the Doctor's old foe the Great Intelligence plans to use Jamie's body. At the end of the story Jamie would remain behind as the new laird, ending his travels with the Doctor. By late April 1968, it was clear that Frazer Hines would be leaving the series sometime during Season Six. One candidate for his departure story was Haisman and Lincoln's third Yeti serial, which they were working on around the start of June. Over the summer, however, the writers became embroiled in a dispute over copyright with the BBC regarding the Quarks, robot monsters which had appeared in their previous "Doctor Who" commission, "The Dominators". The ensuing acrimony resulted in the abandonment of "The Laird of McCrimmon" during August 1968.