In a parody of How the Grinch Stole Christmas, Grinchelica (Angelica Pickles) who, unlike the other Nicktoons, hates Nickmas, possibly because her pigtails are too tight or because she once lost Cynthia, but most likely because she wanted all the chocolate in Toonville. So one year, she decides to steal all the sweets, which include "a chocolate helmet, a chocolate board, chocolate figures of Ultra Lord, chocolate patties on a chocolate grill, chocolate worms from Phil and Lil, chocolate chalk from Rudy's work, chocolate all the way from Irk". However, she is discovered by Plankton Lou Who, who questions her authority. However, Grinchelica simply kicks him back into bed. She goes up a mountain with all the chocolate in tow, but then she thinks about the Nicktoons that won't have their sweets. However, she doesn't care, and begins stuffing her face with chocolate and burping.
"You-Know-Who" might be a reference to Tom Marvolo Riddle, aka Lord Voldemort, from the Harry Potter series.