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 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