Terry is well built, tallish man in his early 20s. He has blonde crew cut, and the look of a nerd who knows how to work a gym.

He's in some sort of jumpsuit/flightsuit affair.

He's from the late 21st century, sometime after the Bowie Base One Disaster. He's smart, but not as smart as he thinks he is.

He works for an independant science or space research during the day. In the evening he's probably an excellent cook. He may be a spy.

Oh, and either 4th Doctor with the wooden console room or 8th doctor with the bats.