The Center of the Earth is a location that appears in Chapter 2 of SuperSponge, a video game for the PlayStation and Game Boy Advance.
The Center of the Earth is located in the inner core of the Earth. It is a wretched place filled with cavernous canyons, thermal tunnels, acrid air pockets, and deadly lava fields. Its inhabited by several species of kelp, seaweed, coral, crabs, yellow starfish, sea slugs, multiple species of jellyfish, and squid. Deep within the lava fields lies a certain contraption called "The Robotic Sub Shark," an invention made by none other than Sheldon J. Plankton.