A nerve gas scientist who once defected wants to defect back from Estonia, but only if INTERSECT can get her and her teenage daughter back to the West.
Casey becomes a fugitive after an INTERSECT agent is murdered and video reveals that Sam is the killer. Suffering from amnesia, he seeks help from a deaf Salvation Army worker while trying to clear his name.
A scientist working on a top-secret project suddenly dies and in order that what he was working on gets finished, Agent Sam Casey must find the dead man's former secretary, now in competition as an Olympic diver, not only to recover the dead man's documents, but for her own protection.
INTERSECT has been infiltrated with spies who are the spitting images of the agency's top agents. Sam Casey discovers the switch, and replaces his double with himself to find out who has done this and what they've found out.
Carl Victor is an INTERSECT scientist who illegally uses government funds to create a doomsday device. When it's discovered, Victor is dismissed from his job but manages to get away with the robot, intending to use it's destructive power to blackmail the government.
Sam is assigned to drive a truck transporting a secret fuel booster that can triple fuel economy in cars, along with the man who developed it. Not only is the additive dangerously unstable and explosive, the scientist has sold out to the oil industry and is now trying to eliminate Sam and all evidence of the chemical.moreless
A government undersea salvage operation is blown up, trapping an agent in the explosion. An unknown chemical reaction has given the agent the ability to render himself invisible and he attempts to use this capability to discover who was responsible for the sabotage.