Sheldon J. Plankton is one of the main characters from the Nickelodeon animated series SpongeBob SquarePants. He is the owner of the Chum Bucket restaurant, and Mr. Krabs' business rival. Due to the pathetic performance of his restaurant, Plankton is constantly trying to steal the secret formula for the Krabby Patty, but he never succeeds.
Appearances in Christmas specials
SpongeBob SquarePants
In the series' first Christmas episode, "Christmas Who?", Plankton makes a very brief cameo during the song "The Very First Christmas", where he is shown receiving a fruitcake from Mr. Krabs. Obviously not pleased about this, Plankton promptly throws the fruitcake into a nearby trash can.
Plankton in Rankin/Bass-styled stop-motion animation, as seen in "It's A SpongeBob Christmas!"
It has been confirmed that Plankton will appear as the antagonist of the series' upcoming second Christmas episode, "It's A SpongeBob Christmas!" It is shown that he makes his own fruitcake laced with an element called jerktonium, which makes anyone who consumes the fruitcake turn bad. Plankton plans to make everyone in Bikini Bottom eat his jerktonium-laced fruitcake so that they will all turn into jerks, making him look nice by comparison.
Other Christmas productions
Plankton also made a few appearances in the Merry Nickmas interstitial shorts. His most prominent role in these shorts was in a parody of Christmas album commercials. In this segment, Plankton advertises his album Plankton's Holiday Hits, which contains his interpretations of "O Come All Ye Faithful", "Joy to the World", "Deck the Halls", and "The Nutcracker Suite". He also briefly appears in "How the You-Know-Who Stole You-Know-What!", portraying the role of Toonville's smallest citizen, Plankton Lou Who (a parody of Cindy Lou Who from How the Grinch Stole Christmas!). Plankton catches Angelica Pickles in the act of stealing all the chocolate candy in his house and asks, "What is going on here?!" Angelica responds by patting his head and kicking his rear end, sending him flying back to his bed. Plankton is also seen attempting to kiss Helga Pataki under the mistletoe in "Holiday Party".