Doctor Who: The Trial of a Time Lord: Mindwarp (TV)

The Valeyard's second segment of evidence relates to the planet Thoros-Beta. Here the Doctor and Peri meet their old adversary Sil and others of his Mentor race, whose leader Kiv is awaiting an operation from a scientist named Crozier to transplant his brain into another body. They also form an uneasy alliance with a kidnapped Krontep warrior, King Yrcanos.