The Dragon Jellyfish is a dragon-like jellyfish that only appears in the episode "Dunces and Dragons." He kidnapped the princess on Planktonamor's orders, and destroyed part of the king's castle.
The Dragon Jellyfish is a huge jellyfish with pink scales on his head, six long tentacle stingers, a barb, red polka dots (just like the regular jellyfishes), and a dragon tail. He is very powerful and has the ability to burn others. He is also very fond of Krabby Patties. He was owned by Planktonamor until he stung him after switching sides due to him tasting SpongeBob's Krabby Patties that he brought with him.