d. David Bradley (1963)
More brains. Well, sort of. Hitler crops up a lot in psychotronic films, either in person or as the justification for various nefarious goings on. Although he is clearly a villain, he is not always the genocidal monster that we know and despise him as. Instead, he is a stereotypical bad person and common or garden megalomaniac, sometimes slightly silly, even comical. It's a facile and potentially offensive view, but I think it comes from an understandable place: these films were made in the aftermath of the war and, even twenty or thirty years later, the enormity of Hitler's crimes were still too much to process - too hard to remember.
The Madman of Mandoras is a load of claptrap about poison gas and the threat to world peace posed by a Third Reich who have run away / relocated to South America. The Nazis have Hitler's head in a jar and it is still giving them orders and rolling his eyes in frustration and anger. No idea why they haven't attached a body to the head, they're clearly pretty technologically advanced. Perhaps it's better to know where that guy is.
Do the Nazis succeed? Do they fuck, and we get to see the flesh burned from Das Fuhrer's skull, a sight that is unedifying but strangely satisfying, which is perhaps why we get to watch it for a whole minute and a half.