21 Doctor Who Actors Who Were Also In Harry Potter

15. John Cleese

While appearing briefly in the 1979 Doctor Who episode City of Death, Harry Potter fans will know and love John Cleese as Nearly Headless Nick. His name pretty much speaks for itself.
Contributor
Contributor

I'm a writer, most days disguised as a receptionist. Or was it the other way around? Your average 26 year old dreamer, patiently waiting for a mad man in a blue box to whisk her away on an adventure through time and space (and trying to squeeze in a decent bit of writing in between).