Toopyar

From Tardis Wiki, the free Doctor Who reference

Toopyar was a human colonist on F-four.

The colony suffered from sterility. When the Fifth Doctor, Tegan and Nyssa arrived, Toopyar and Nyssa performed tests on the crops to determine the cause of the sterility. They discovered, by doing tests on Toopyar's blood, that the colonists were carriers of a disease deadly to humans. (PROSE: No Exit)