The Ghosteroid is a giant Ghost from outer space which was lured in to slime and annihilate Pac-World by Dr. Buttocks, who soon found out that the Ghosteroid would also annihilate the Netherworld too, so they are forced to root for Pac to stop the Ghosteroid.
As mentioned above, the Ghosteroid is a giant dark purple Ghost with a blue ring surrounding it.
- The Ghosteroid is destroying PacWorld and NetherWorld.
- Its name is a portmaneau of "ghost" and "astroid".
|Pac-Man and the Ghostly Adventures Characters|
|Pac-Man | Cylindria | Spiral | Ghost Gang (Blinky - Inky - Pinky - Clyde) | Betrayus|
|President Spheros | Sir Cumference | Grinder | Fuzbitz | Dr. Buttocks | Butt-ler|
|Skeebo | Spheria | Ms. Globular | Mr. Strictler | Mr. Dome | Braces | Zac | Sunny | Obtuse | Pacinator | Lightning Ghost | Mavis | Specter | Fred | Cyclops Ghost | Ogle | Fire Ghost | Ice Ghost | Tentacle Ghost | Guardian Ghost | Aqua Ghost | Drill-Bit Ghost | Alien Ghost | Ghosteroid | Ghost Shark | Apex |Professor PointyBrains | Tip | Madame Ghoulasha | Count Pacula | Fluffy | Nether-Gargoyle | Nether-Slug | Pac-Dragon | Stalker | Venus Dragon Flytrap | Monobat | Stone Temple Guardian | Jean | Do-ug | Cap'n Banshee | Elli | Dr. Pacenstein | Moondog | Starchild | Grannie | Santa Pac | Grindette | Eeghost|