Joinson Dastari

Joinson Dastari was a highly qualified scientist (the Second Doctor once said he had enough letters after his name for two alphabets) who worked on Space Station Chimera, developing time travel by recreating the Kartz-Reimer experiments. He had used technological augmentation to make an Androgum, Chessene of the Franzine Grig into a genius.

With Chessene, a prototype time machine and an un-altered Androgum, Shockeye of the Quawncing Grig, Dastari abducted the Doctor from the space station. Having landed in the city of Seville on the planet Earth, he worked to find the secret of the Rassilon Imprimatur for the Sontaran Stike. He later supervised the partial genetic transformation of the Doctor into an Androgum.

Dastari walked in on his partner, Chessene, as she lapped up the blood of another incarnation of the Doctor who had come to rescue his past self. When the disgusted Dastari stated that he now considered Chessene as animalistic as ever, she turned on and killed him. (DW: The Two Doctors)

Behind the scenes

 * "Dastari" is an an anagram of "A TARDIS".
 * The BBC Classic Series website suggests that Dastari's knowledge of Gallifrey implies he hails from a Gallifreyan colony planet, like Minyos (DW: Underworld), Dronid (DW: Shada) or Mawdryn's homeworld (DW: Mawdryn Undead).