Man Rayopolis (formerly Bikini Bottom) is an alternate universe version of Bikini Bottom that is ruled by Man Ray.
In the early days of Bikini Bottom, Man Ray showed up to take control of Bikini Bottom. However, he was stopped by Mermaid Man and Barnacle Boy when they trapped him in Tartar Sauce. However, several decades later, SpongeBob, Patrick, Mermaid Man, and Barnacle Boy went back in time and Patrick ate the Tartar sauce. Therefore, Man Ray was able to take control of Bikini Bottom and capture Mermaid Man and Barnacle Boy.
SpongeBob and Patrick returned to their own time to find that Bikini Bottom was replaced by "Man Rayopolis."