Big Lenny

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Dr. Manowar, the only person to survive an attack from Big Lenny

Big Lenny is a large and dangerous Jellyfish, and one of the only known Jellyfish to actually kill its stinging victims. As SpongeBob revealed in I'm Your Biggest Fanatic, Dr. Manowar is the only person who has survived an attack by Big Lenny, getting by only with a huge bump that hurts when anything touches.

Trivia

• Big Lenny has never made a true appearance in the series.
• Unlike other Jellyfish stings, people can die if stung by Big Lenny.
• It has never been seen in places like Jellyfish Fields, so it probably lives in a prison, a safekeeping area or in a jellyfish field too dangerous to jellyfish.
• The only time it was seen in Jellyfish Fields is in the game Operation Krabby Patty.
• He may be a Portuguese Man-of-war or an Australian Box Jelly or even a Lion's mane, because all are incredibly deadly.