Zarax was a Flinduvian from planet Flinduvia.
After his death, his body was taken to be the first in a series of corpses reanimated by Earthling ghosts. However, Anthony Walker's living spirit was accidentally placed inside instead, and was able to gain control of the body when another Flinduvian named Frax threatened his sister. Zarax's body went into the infamous "Red Haze" and beat up all of the other Flinduvians, even resisting a sonic disruptor.
Anthony's spirit was finally able to leave Zarax's body when the ghost of the deceased Martin Morleskievitch took his place. With his new body, Martin returned to Flinduvia as an unofficial spy for the Coalition of Civilized Worlds.