Gage

Gage was a member of the Space Security Service who arrested the First Doctor and Steven Taylor. He was worried about killing the Doctor and Steven. He was a Sontaran who was augmented by Rutan Host technology to look like a Human. He was severely injured. After being uncovered, he suggested torturing Sara Kingdom and Steven to get the Doctor to talk. He was killed by Slite. (AUDIO: The Sontarans)