Lord Poltergeist is a creepy poltergeist of godly power and the main antagonist of the SpongeBob SquarePants episode "Ghoul Fools".
He was voiced by Chris Elliott.
When SpongeBob and Patrick enter the house, Patrick thinks that he is not a real poltergeist. They do find out he is real when he makes a pizza with Anchovies on it. Then, Lord Poltergeist sends them out to get a new head gasket for his ship, claiming that he will keep their souls if they fail. He gets the help of Squidward, Mr. Krabs, and Sandy to give Poltergeist the gasket (but Mr. Krabs wanted to go there only for the poltergeist's treasure).
However, once he got the head gasket, it is revealed that Poltergeist doesn't really have their souls. They were actually old orange sodas that were left out in the sun too long. He has lots of sacks of gold doubloons, and Mr. Krabs, Patrick, and Squidward try to steal away from him. SpongeBob did not like that. When Lord Poltergeist saw Mr. Krabs, Squidward, and Patrick trying to steal his money he said "stop right there". But they ignore him by running away, although he catches them in his "void", where they are forced to suffer eternal torment.
Krabs' torment was an outhouse that cost one doubloon to use, Patrick's torment was being unable to eat a donut on his head (which turns out to be worse for the donut), and Squidward's torment, obviously, was SpongeBob. Sandy uses her ghost catching equipment to bring everyone out of the void. Soon, SpongeBob finds out that Lord Poltergeist's gold that Mr. Krabs wanted actually belonged to the Flying Dutchman, and he and his crew, where originally the Flying Dutchman's but they betrayed him and ran off with the gold.
He then claimed that the Flying Dutchman would never find him, only to be disproved second's later, as Spongebob called him to report his stolen property. Poltergeist claimed he went out for pizza and got lost, but was searching for the Dutchman to give his treasure back. He hands the treasure over, only to quickly take it back and make a run for it. However, the engine room breaks down and the Dutchman catches up, turns into an atomic bomb, and explodes, banishing everyone to the void. Poltergeist is next seen letting customers into the Krusty Krab as the episode ends.