Blue Jellyfish are a rarely seen color variant of jellyfish and are thought to be a rare subspecies.

They could be blue bottles due to their similiarity to jellyfish and also similiar appearance.

The first instance of a blue jellyfish is in "Tea at the Treedome".

The most prominent appearance of a blue jellyfish is in "Jellyfish Hunter." The blue jellyfish was known as "No Name". No Name helped SpongeBob stop Mr. Krabs from using jellyfish jelly for the Krabby Patties, in which they succeeded. In the end, No Name let itself be caught by SpongeBob and was renamed "Friend".

In the video game, Revenge of the Flying Dutchman, the player fights wild blue jellyfish. A boss is a big blue jellyfish with smaller ones protecting it. To defeat the boss, the player must catch the smaller blue ones with the fishing net, not touching them. While the player catches the jellyfish, they must hit the blue jellyfish with the bubbles to become the greatest jellyfisher ever. Blowing bubbles on the stingers is uneffective. Wild blue jellyfish also appear in the video game, Battle for Bikini Bottom. They only appear in certain areas of jellyfish fields, and they are faster than normal jellyfish and take two hits to defeat.

Blue jellyfish have also been seen in "The Pink Purloiner" and "The Thing".

Characters
Main SpongeBob • Patrick • Sandy • Squidward • Mr. Krabs • Plankton • Gary Major Mrs. Puff • Pearl • Karen • Mermaid Man • Barnacle Boy • Larry the Lobster • Nat Peterson • Harold • Scooter • Betsy Krabs • Man Ray • Dirty Bubble • Squilliam Fancyson • French Narrator • King Neptune • Mrs. SquarePants • Nancy Suzy Fish • Fred • Gill Gilliam • Johnny • Mable • Old Man Jenkins • Tom • Lou • Lenny • Cora Rechid • Monroe Timmy • Shubie • Dennis • Johnny Erain • Martha Smith • Sally • Flying Dutchman • Patchy the Pirate • Potty the Parrot Minor Annette • Bubble Bass • Bubble Buddy • Bubble Bust • Buiser • Carl • Clamu • Craig Mammalton • Dexter Blubbuns • Jack M. Crazyfish • Dennis (mercenary) • DoodleBob • Dr. Marmalade • Filthy Phil • Milo J. Finkerfish • Flatts the Flounder • Frank (citizen) • Frank (store owner) • Gene Scallop • Glovie • Gorilla • Grandma SquarePants • Heart Man • Horace A. Whopper • Horace B. Magic • Jim • King Krabs • Marty • Queen Mildew • Mrs. SquarePants • Patar • Patty • Mindy • Mr. Seaweed Monsterman • Moth • Ned and the Needlefish • Perch Perkins • Prawn • Salesman • Sandman • Sea Bear • Sea Rhinoceros • Smitty Werben Jigger Man Jensen • Spat • Squid Wood • Mr. Bakerman • Stinky • Tattletale Strangler •Mr. Tentacles • Mrs. Tentacles • Tina • What Zit Tooya • Nicholas Whithers • George the Zebra • Painty the Pirate • Dr. Manowar • David Hasselhoff • Lion Fish • Kevin C. Cucumber • Nosferatu • Queen Amphitrite • Robot SpongeBob • Robot DX29488 Groups TUOOFATTAFAD • Anchovies • Bikini Bottom Symphony Orchestra • Blue Jellyfish • Boys Who Cry • SquarePants family • Tentacles family • Krabs Family • Plankton Family • Patrick and Gary's family • Cheeks family
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