Entirely different mind transplant technologies and Chekhov’s waisted stinger
As the trial of our favourite Time Lord continues, the court is MST3K’d to the Doctor’s most recent adventure on the planet of Thoros Beta, a planet so mesmerizingly and distractingly coloured that he and Peri soon venture below ground instead. There, they encounter a sharp-toothed monster, but the first of many genetically manipulated creatures in this world, and learn that the population of Thoros Beta are at the economical despotic mercy of none other than Sil (of Vengeance on Varos fame) and his master Kiv.
Kiv is suffering from an overly expansive cerebellum and needs a brain transplant pronto, which is why they keep a mad scientist on payroll. Crozier—that’s the demented surgeon in question—has not only been scientifically enslaving people to work for Kiv, but has been working to perfect his ultimate creation: a device that allows him to transplant the mind of any living being into any other. And with Doc and Peri on Thoros Beta, it would seem he has two fresh subjects for his experiments.