This castle is the home of the mighty king of the sea, King Neptune.
I can turn into a skyscraper!
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The SpongeBob SquarePants Movie (book)
Just like in the movie and Cine-Manga book, Plankton sneaks into King Neptune's castle where he can steal the Crown.
The SpongeBob SquarePants Movie
In the movie, Plankton sneaks into King Neptune's castle where he can begin the phase of Plan Z. After getting past the guards, he snuck up to the stool, stole Neptune's crown, and left a fake note about Mr. Krabs stealing it.