By accident, the content of a computer encyclopedia is transferred into the brain of Dexter Riley, a less than average college boy. Because of his newly acquired knowledge he competes in a quiz show between various universities, where he sweeps all the points. A wiz kid from another university finds out about his cheated wisdom and does everything to discredit Dexter.

A secret agent masquerades as a toy-seller, successfully concealing his alter ego even from his young son until, on a daring mission, he is captured by an evil arms dealer, then it falls to his inexperienced offspring to save the day.