Steve Gray

Private Steve Gray was a UNIT soldier.

Biography
During Operation Blue Sky he was hypnotised by General Staal alongside his comrade Private Carl Harris. Staal had declared him an unfit soldier prior to this. He was later used to teleport the TARDIS to the Sontarans' ship, and he was later killed by a Sontaran soldier alongside Harris after the pair had completed their objectives. (DW: The Sontaran Stratagem/The Poison Sky)

Alternate timeline
He along with Private Harris and Colonel Mace appeared to recover the body of the Tenth Doctor after he lost his battle with the Empress of the Racnoss in an alternate world. (DW: Turn Left)