I agree.  Middleton IS Ming.  No one else will do!!
No one else could blink like him either..so there!!
I think the problem may be not watching FLASH GORDON first.
Should I mention STRANGLER OF THE SWAMP?  He is really creepy in that.  In fact, like Lugosi or Karloff, anything with Charles Middleton is worth seeking out.  Tom Weaver turned me on to MYSTERY RANCH a few years back.   That film is full of Middleton wonderfullness.
And neither Karloff or Lugosi can say that they sang and danced in a film with the Marx Brothers.
You know, I can't think of anything he was bad in.  Someone should do a book on him.  I really know nothing about the man.
Middleton IS Pa Stark, too.  This guy here is an impostor!  He just looks like him judging by his avatar.