Mike Yates

UNIT captain who helped the Third Doctor in his battles against the Master, the Nestene and their deadly Autons, the Mind of Evil, Axos, Azal, the Daleks, Kronos, and BOSS.  He was later brainwashed by BOSS and possibly as a consequence, later betrayed UNIT by helping Sir Charles Grover to launch his Operation Golden Age.   After Yates was exposed, he was given extended sick leave and a chance to resign quietly.  He redeemed himself in the fight against the Spiders of Metebelis 3, during which he was wounded and cured by K'anpo.  Yate's image was used by Rassilon to ward off the Third Doctor.