|Founder:||Sheldon J. Plankton|
|Employment:|| Brainwashed Bikini Bottomites|
Brainwashed King Neptune
|Products:||Chum Bucket helments|
|First appearance:||The SpongeBob SquarePants Movie|
|List of places|
Planktopolis is an alternate version of Bikini Bottom, where it was controlled by Plankton. It was seen in the The SpongeBob SquarePants Movie. Planktopolis looked very gloomy and the sky was a gloomy dark red color.
In the background of Planktopolis, you can see the Krusty Krab and the Krusty Krab 2. You can also see three statues of Plankton. You can also see the poor Bikini Bottom citizens working for the evil Sheldon J. Plankton.