It is a golden trident which is owned by King Neptune. It has a switch that can be turned on to make the trident larger and more powerful. It also has a personality of its own, as it can be angered.
Role in series
King Neptune holds the trident throughout the scene at the Fry Cook Museum.
The SpongeBob SquarePants Movie
I can turn into a skyscraper!
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SpongeBob accidentally picks up King Neptune's trident and takes it to the Krusty Krab. He accidentally makes dancing Krabby Patties and the customers love it, so Mr. Krabs tells him to make more. SpongeBob angers the trident while trying to make more of the dancing Krabby Patties, so it causes trouble instead of good.
Later, SpongeBob turns on the switch and the trident becomes larger and powerful. SpongeBob says he is going to help the people of Bikini Bottom with it, but he only causes trouble and chaos for them.
King Neptune later regains possession of the trident.