Beavis

Dr. Beavis was an eccentrically dressed medical specialist called in from London by Ashbridge Cottage Hospital to take a look at the Third Doctor.

Biography
Beavis enlisted Corporal Forbes to guard his vintage car and seemed very doubtful of Henderson's claims that the Doctor had an alien physiology. He unknowingly crossed paths with the mysterious patient who was showering with his back intentionally turned when Drs. Beavis and Henderson entered the physicians' locker room where he deposited his hat and cape.

After stealing a velvet suit (either belonging to an unknown physician or one of the hospital's in-patients), the Doctor similarly stole Dr. Beavis's hat and cape. In escaping from the hospital, the Doctor coincidentally stole Beavis's antique car as it was the first one he found without an ignition lock. Dr. Beavis's property was eventually returned. (TV: Spearhead from Space)