Santa's Toy Factory appeared in Operation: N.A.U.G.H.T.Y., where Santa's elves work and sing while working on toys. The song that they sing is rainbow Christmas and is in the same tune as the rainbow monkey theme song. The elves don't seem to care when someone breaks in. That's what happened when the Delightful Children From Down the Lane broke in. All they said was 'Merry Christmas.