|Founder:||Sheldon J. Plankton|
|Location:||Bikini Bottom, Pacific Ocean|
|Employment:|| Brainwashed Bikini Bottomites|
Brainwashed King Neptune
|First appearance:||The SpongeBob SquarePants Movie|
|Latest appearance:||The SpongeBob SquarePants Movie (video game)|
|List of places|
Planktopolis is the temporary rename of Bikini Bottom when Plankton succeeded in bringing about Plan Z and enslaved all the Bikini Bottomities using mind control buckets. It was seen in the The SpongeBob SquarePants Movie and the video game. Planktopolis looked very gloomy and the sky was a gloomy dark red color. Planktopolis was filled with Plankton statues which Plankton's mind controlled slaves built for him.
In the background of Planktopolis, the Krusty Krab can be seen as well as the Krusty Krab 2. There are also three statues of Plankton that can be seen around. The mind-controlled Bikini Bottom citizens can also be seen working for the evil Sheldon J. Plankton.
- The sky is similar to the Shelly Superhighway construction scene in "SpongeBob's Last Stand."
- Planktopolis looks different in the The SpongeBob SquarePants Movie (video game).