On the eve of his 25th birthday, Pac-Man and former foe turned ally Orson must fight off monsters from the spectral realm that have been unleashed on Pac-World by the evil scientist Erwin.On the eve of his 25th birthday, Pac-Man and former foe turned ally Orson must fight off monsters from the spectral realm that have been unleashed on Pac-World by the evil scientist Erwin.On the eve of his 25th birthday, Pac-Man and former foe turned ally Orson must fight off monsters from the spectral realm that have been unleashed on Pac-World by the evil scientist Erwin.