I've never see Peter Cushing as Dr. Who. There was a little guy with dark hair and bangs as the first Dr., and I think John Pertwee was the second Dr, but my very favorite was Tom Baker. I loved his long striped scarf and his fedora.
Patrick Troughton (the Moe-looking guy) was the second Doctor. The first one was William Harnell.
I just watched "Dr. Who and the Daleks." Apparently there's another Peter Cushing/ Dr. Who movie where the Daleks trash London. Let's see if Netflix has that one.