Jack (The Switching)
From Tardis Wiki, the free Doctor Who reference
Jack was a UNIT soldier.
He was on duty when the Master, in the Third Doctor's body, headed for the Doctor's laboratory. Jack asked the "Doctor" for some identification, but when the Master couldn't produce any, Jack winked and said he was just "having you on". Sergeant Benton showed up and sent Jack on his way. Jack saluted them both and left. (PROSE: The Switching)
