Invader ZIM (2001)

S2E1 The Most Horrible X-mas Ever

Title: The Worst Christmas Ever Plot: Zim devises a scheme to conquer Earth by disguising himself as Santa Claus, but his plan begins to unravel as he inadvertently adopts the traits of the beloved holiday figure. In the midst of this chaos, Dib races against time to protect humanity from the looming catastrophe.