Colin Baker's final season of Doctor Who begins and comes to an end in this episode of Bigger on the Inside. In the 14-part "The Trial of a Time Lord," The Doctor must fight for his remaining lives against a supposedly immortal robot ("The Mysterious Planet"), a returned Sil ("Mindwarp"), vulgar-looking plant-monsters ("Terror of the Vervoids"), and his accuser: The Valeyard ("The Ultimate Foe")! As Dan and Mike say goodbye to Peri and Colin Baker, they greet Mel, have fun with the Vervoid costumes, and Mike discovers a new fetish: grannies with assault rifles.