A government undersea salvage operation is blown up, trapping an agent in the explosion. But a chemical reaction has given the man the ability to render himself invisible. The agent attempts to use this capability to discover who was responsible for the sabotage

Sam is assigned to drive a truck transporting a secret fuel additive that can triple fuel economy in cars, along with the man who developed it. Unfortunately, the additive is unstable and explosive and the scientist has sold out and is trying to eliminate Sam and the evidence

After a scientist is fired for building a doomsday machine, he uses the robot against the government in a blackmail plan

A group of spies infiltrates Intersect with a double of Sam, so he turns the tables by taking the imposter's place in the group

A scientist for a government research project is dead, and Sam must find the old man's secretary in hopes of learning how to complete the project

Sam is being hunted for the apparent murder of an Intersect agent, and there is video tape to prove it. Only Sam doesn't remember doing it and while on the run, attempts to clear his name.

Casey's attempt to help a noted female scientist defect from an Iron Curtain country is hampered by the woman's daughter, whose attachment to a double-crosser jeopardizes the trio's escape.

Sam's friend Buffalo Bill gets him a job working on the pit crew for the racing car The Special. Buffalo doesn't know that his boss is involved with sabotage, and has hidden Dutrium--a powerful explosive--in The Special

Mutinous crew members hold a shipping magnate, Miss Carlisle, hostage.

Top boxer Arch Kingston left the business following the death of his brother in the ring. But he decides to come back one last time for promoter Harry Trent, only he doesn't trust Trent and asks Sam to use his ability in the ring to keep things honest.

In order to stop a civil war, agent Sam Casey must restore a notorious dictator to power.

Sam must foil an assassination plot against Alexander Kodesko, an activist\n\nfrom Lithuania, when Officer Nick Brodenski, who is assigned to crowd\n\ncontrol of a rally by Kodesko, is photographed in Lithuania when he claims\n\nto have been in Mexico.