Trion (species)

Turlough, a Trion political prisoner.

The Trion are a race of humanoids from Trion. They look identical to humans and can survive in similar conditions.

Since the nurse at Turlough's school had no problem when examining Turlough, that would imply that Trions have similar, if not identical, internal structure to humans. (DW: Mawdryn Undead) Based on Turlough's comments, he may be older then he looks, implying a different aging rate. (DW: Terminus)

Following a civil war on Trion, the losing side and their families were sent to various other planets, such as Earth (though this practice was later abandoned).