SpongeBob SquarePants takes place in its own fictional universe and is not officially connected to any other television show. However, there have been crossover episodes with other Nickelodeon shows, such as "Jimmy Neutron: Boy Genius" and "The Fairly OddParents," where characters from different series interact with each other. These crossovers are considered non-canon, meaning they do not affect the main storyline or universe of the individual shows.
