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In the eighth episode of the season-long continuity "The Trial of the Time Lord," the Doctor (Colin Baker) refutes videotaped evidence of his "treachery" on the planet Thoros Beta. It doesn't look good for the Doctor, however, since the tapes suggest that he willingly served up a reluctant Peri (Nicola Bryant) as a body donor in a brain-transplant experiment performed by scientist Crozier (Patrick Ryecart) on the planet's leader Kiv (Christopher Ryan). The outraged Time Lords, ignoring the Doctor's insistence that the evidence is entirely misleading, are forced to take drastic measures. This episode served as the series swan song for co-star Nicola Bryant. Written by Philip Martin and originally telecast on October 24, 1986, Doctor Who: The Trial of a Time Lord, Episode 8 is actually the concluding chapter of the four-part story arc "Mindwarp."