Planktopolis is the temporary rename of Bikini Bottom when Plankton succeeds in bringing about Plan Z and enslaves all the Bikini Bottomites, using mind-control bucket helmets. It appears in the The SpongeBob SquarePants Movie and its video game adaptation.
It looks very gloomy and the sky is a gloomy dark red color. Planktopolis is filled with Plankton statues that Plankton's mind-controlled slaves built for him. In the background, the Krusty Krab can be seen as well as the Krusty Krab 2.
- The sky is similar to the Shelly Superhighway construction scene in "SpongeBob's Last Stand."
- Planktopolis looks different in the SpongeBob SquarePants Movie video game.