Enter Robo-Hitler.
He shoots lasers out of his eyes.
His moustache is a secret communication device for the homeworld.
His people run on Jewanite, a rare mineral found only in jews that is extracted by burning.
And of course history ends up fucked when their little trip to the past results in eisenhour starting a homosexual relationship with churchill. Let's just beaches were stormed and invasions were done. In the ass.