The King Jellyfish, also known by its Latin name, Cnidaria rex, is a rare kind of jellyfish. He first appears in the episode "I'm Your Biggest Fanatic" and later in the video games Battle for Bikini Bottom, The Yellow Avenger, the DS version of SpongeBob's Atlantis SquarePantis, Demolition Sponge, SpongeBob: Patty Pursuit, Battle for Bikini Bottom: Rehydrated, Nickelodeon All-Star Brawl, and the book Tales from Bikini Bottom.
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