Mitch investigates the disappearance of two Baywatch lifeguards without a trace in the water going after cries of drowning. When Donna also goes missing, Mitch investigates an old auto accident with one survivor who may hold a clue to the disappearances.

A space shuttle accidentally drops a load of radio active dust which lands in a farmer's field. Mitch and Griff have to handle the work of cleaning up the strange matter when Ryan is infected by the stuff.