Ralph Hinkley, an average school teacher, is given a suit with amazing powers by aliens. Now, Ralph must decide if he'll use his new powers to fight crime, even though he already lost the suit's instruction manual.

Bill, who has been trying to bust open a drug ring for over 20 years, must drive a witness to Los Angeles for the trial of the gang leader and asks Ralph for help.

When a secret gunsight is stolen, Bill asks Ralph for help in solving the case. However, Ralph runs into problems when he keeps turning invisible unexpectedly, and must deal with the pressure of meeting Pam's parents.

Russians are trying to find an heiress and her Russian husband in order to force them to establish a missile cache hold on their private island. Bill needs Ralph's help when he is suspected of failing a lie-detector test at FBI headquarters.

Ralph uses his suit to help Rhonda, one of his students, after her mother is kidnapped by the Russians.

Ralph lends Tony a hand by finding him a job as a car repossesser. When Tony is arrested for arson, Ralph and Bill team up to find the real criminal.

Au siège du FBI, des promotions sont distribuées. Cependant, Bill envisage de prendre sa retraite. Pendant ce temps, Ralph doit utiliser son costume pour sauver Pam lorsqu'elle découvre que son patron est à la tête d'une opération clandestine.