A herpetologist investigating a series of fatal rattlesnake attacks discovers that the creatures have been infected by a mysterious nerve gas disposed of in the desert by the military.

From deep within the tomb of the Egyptian pharaoh Tutankhamun, Professor Douglas McCadden ships the coffin of Ankh-Vanharis to the California Institute of Sciences where X-rays reveal five diamond-like crystals hidden within the coffin. Technician Peter Sharpe steals the crystals but doesn't notice that the powerful X-ray has revived a green fungus. When the coffin is opened at a university press conference, the reporters uncover more than they bargained for. The mummy has disappeared... and the Time Walker is alive again!

Strange things begin to occur as a tiny California coastal town prepares to commemorate its centenary. Inanimate objects spring eerily to life; Rev. Malone stumbles upon a dark secret about the town's founding; radio announcer Stevie witnesses a mystical fire; and hitchhiker Elizabeth discovers the mutilated corpse of a fisherman. Then a mysterious iridescent fog descends upon the village, and more people start to die.

A highway patrol officer, two criminals, and a station secretary form an unlikely alliance to defend a defunct Los Angeles precinct against a siege by a bloodthirsty street gang.

First-time father Henry Spencer tries to survive his industrial environment, his angry girlfriend, and the unbearable screams of his newly born mutant child.