Premise: Mike Yates invites Sarah to visit him at a Buddhist centre where he’s been staying since his resignation from UNIT. He suspects evil is afoot there...
Notes: Following the shocking death of Roger Delgado and the departure of Katy Manning from the show, Jon Pertwee had made the decision to leave feeling that an era was coming to an end. Producer Barry Letts and script editor Terrance Dicks were also moving on from the series. The exciting chase scene, which took up most of part two, featured Bessie, the Whomobile (made to fly through CSO), a gyrocopter, a police car, a hovercraft and a speedboat.
Verdict: With an exciting (if a little over the top) chase scene, shoddy CSO, great acting, witty gems of dialogue, UNIT, thought provoking moments, venusian aikido and slightly forced buddhist beliefs, this serial is the perfect summary of Jon Pertwee's era and a fitting end to his time as the Doctor 8/10