Time travel in SpongeBob SquarePants serves as a narrative device to explore character extremes. For Plankton, it is a tool of ambition that inevitably fails. For SpongeBob, it is a vehicle for innocence that inevitably restores order. Whether through magical medieval crowns or futuristic freezers, the series posits that while one can move through time, one cannot escape the fundamental nature of their character—a lesson Sheldon Plankton learns time and time again.