Thanks to the school bully, Pac-Man accidentally opens the portal to the Netherworld, unleashing an army of ghosts, led by the fiery Lord Betrayus! Lucky for Pac-World, the Legend of Last Yellow Orb proves to be true: thanks to power-berries from the ancient Tree Of Life, young Pac has the ability to eat the ghosts… and burp out their eyeballs! WOW! Unfortunately, the ghosts manage to steal the Tree Of Life, which could mean the end of PacWorld!

PacWorld is under siege by ghosts and there are no more fresh berries from the Tree of Life; Pac strikes a deal with four ghosts, Inky, Blinky, Pinky and Clyde, to lead him into the Netherworld to try and find the tree and save PacWorld.

After Pac and his friends defeat all the ghosts, Betrayus clones an army of Netherworld monsters.

Dr. Buttocks invents the Molecular Magnifier to create gigantic monsters.

Lord Betrayus plans to render Pac powerless – by getting Inky, Blinky, Pinky and Clyde to feed Pac so much he'll be too full to eat anything else... power berries or ghosts! But Pac isn't getting full, even when he's eating everything in both worlds!

President Spheros starts behaving strangely and makes Pac and his friends suspicious.