Adolf Hitler

In the year 3000's Head Museum, jars of preserved heads represent history's notable figures, and among the endless rows sits Hitler's head—one artifact among thousands, wheeled out mainly for background gags about how the future treats even the worst of history as museum curiosities.

The joke isn't Hitler himself but the flattening: Futurama's future has reduced every historical monster and hero alike to a talking head in a jar, equally trivial, equally dusty. It's a sharp, uncomfortable bit of satire about how time erodes significance, delivered with the show's typical deadpan indifference rather than any actual screen time or dialogue worth remembering.