 An underground data-storage facility uncovers a problem when they excavate a tunnel for a new wing. Carl investigates the deaths of several employees of the facility who appeared to have been killed by a wild animal, and he discovers a rampaging reptile that has been disturbed by the digging of the tunnel. As Kolchak tries to stay one step ahead of the law, the beast continues its assault on the facility, destroying anything and everything in its quest for the eggs that have been stolen from its nest.