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Blue Jellyfish are a rarely seen color variant of jellyfish and are thought to be a rare class of the species. They appear in the episodes "Tea at the Treedome," "Jellyfish Hunter," "The Thing," and the video game SpongeBob's Atlantis SquarePantis.
Blue jellyfish are very rare. They are known to be very agile and stealthy, and they create blue jelly instead of pink like the pink jellyfish. SpongeBob (eventually) captured one called "No Name" in the episode "Jellyfish Hunter" and named him "Friend" before releasing him and giving him a "handshake."
Blue jellyfish are often seen in Jellyfish Fields.