SpongeBob SquarePants

Evil Alien Jellyfish Overlord

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Evil Alien Jellyfish Overlord
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Evil Alien Jellyfish Overlord was an alien and jellyfish-like monster who was the main antagonist of the episode Planet of the Jellyfish. It kidnapped Patrick, Squidward, Mr. Krabs, Gary, and everyone in Bikini Bottom, except SpongeBob and Sandy and possibly a few others. It was the leader of the alien jellyfishes known as Jellions and almost succeeded in taking over Bikini Bottom until Sandy and SpongeBob showed up.


Evil Alien Jellyfish Overlord cave

The overlord creating more jellions.

The Evil Alien Jellyfish Overlord looks like a giant, alien jellyfish and had the ability to eat regular jellyfish and create Jellions in their place. It then tells the newly made Jellions to eat everyone in Bikini Bottom, turn them into Jellion Clones, and take away the real copies. Near the end of the episode, the Overlord somehow ends up in the Krusty Krab (probability flew/swam over there) where it held everyone, even SpongeBob's spatula, captive in pods inside the freezer. When SpongeBob squirted mayonnaise on it, it was melted away along with all the other clones.


The Evil Alien Jellyfish Overlord's weakness is mayonnaise. SpongeBob managed to find this out after the Jellion Clones in the Krusty Krab only ordered Krabby Patties without mayonnaise. Even one little squirt of the condiment will completely destroy any Jellion and Jellion Clone as SpongeBob and Sandy fought through the Krusty Krab using a jug of mayonnaise. The Overlord was eventually defeated after Sandy turned up the thermostat causing a block of mayonnaise (which SpongeBob threw at it but it froze and the block landed on his head) to melt on it. All of the Jellions and Jellion Clones were killed and Bikini Bottom was saved.


  • Where the Evil Alien Jellyfish Overlord comes from is currently unknown as it was first seen in a cave at Jellyfish Fields.
    • It may have come from space since it is an alien.
  • It is also unknown how the Overlord ended up in the freezer of the Krusty Krab or why it went there. It could've swam there.
    • The Overlord may have stayed in the freezer because it knows mayonnaise, it's weakness, will get frozen.
  • The Overlord manages to clone almost all of the main characters except for SpongeBob, Sandy, and Plankton (who wasn't seen anywhere during this episode).
  • The Evil Alien Jellyfish Overlord and the Jellions are a parody of "Invasion of the Body Snatchers".
  • His remains were used as green relish.
  • He is based on a Phronima, a deep-sea animal that hijacks the body of other deep-sea creatures. 
  • His secret lair was at the Krusty Krab's freezer.

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