Jeremy Young
From Tardis Wiki, the free Doctor Who reference
Jeremy Young (born 1934[1]) appeared in two Doctor Who television stories: as Kal in An Unearthly Child and Gordon Lowery in Mission to the Unknown.
From 1961 to 1976, he was married to Kate O'Mara, who played the the Rani in the later seasons of the original series of Doctor Who. He has the distinction of being the first actor to portray a villain in Doctor Who, and, coincidentally, was wed to another person who played a prominent villain on the show.