Alien Ghosts are the ghosts of an unknown alien species and many reside within the massive Ghosteroid which drifts through space. They are a species of extraterrestrial ghosts that shares a symbiotic relationship with Ghosteroids. The Ghosteroid shelters the Alien Ghosts, and in return, the Alien Ghosts protect it. Alien Ghosts first appeared in the Pac-Man and the Ghostly Adventures episode, "Planet Pac Versus the Ghosteroid". They show up during Pac's attempt to stop the Ghosteroid from colliding with Pac-World.
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