Perpugilliam ("Peri") Brown

Companion to both the Fifth and Sixth Doctors. She was an American whom the Fifth Doctor met on a Greek island where her stepfather, Prof. Foster, had just located a Trion artefact. She then travelled with the Fifth Doctor to Sarn, where she helped him defeat the Master. She was infected with raw spectrox on Androzani Minor, and the Fifth Doctor sacrificed his life to give Peri the antidote. She watched him regenerate and had to put up with the mood swings which immediately followed the regeneration. She aided the Sixth Doctor defeat Mestor and the Cybermen. On Varos, she was almost transmogrified into a bird and helped the Doctor defeat Sil. She then helped him fight the Master and the Rani. She encountered the Doctor's Second Incarnation and Jamie, and helped the two Doctors defeat the Sontarans. She then fought alongside the Doctor against the Borad, Davros and his Daleks, and Drathro on Ravolox. On Thoros-Beta, she was captured by the Mentors and almost killed by Crozier when he tried transferring Kiv's mind into her body. (The Valeyard used a doctored version of this event, in which Peri was actually killed, during the Trial of the Doctor.) In reality, Peri was saved by King Yrcanos of Krontep, whom she later married.