"A Neutron Family Christmas" serves as the alternate ending to "Jimmy Neutron Happy Family Happy Hour"
Jimmy died at the hands of the aggressive pizza instead of Hugh (well, he was standing right there when the pizza came to life). With no son to bond with, and no wife to cook delicious dinner meals, Hugh falls into a depression, becoming worse as time went on, to the point he acted the way he did by the time of the Christmas short.
