A student discovers the key to super strength by mixing chemicals with his breakfast cereal.

When Dexter Riley's science class experiment gets mixed into another student's cereal, the two kids give the mixture to a neighbor's cow and find that it gives her super-strength. So they try it themselves and learn that it works on humans, too. The dean of the school, who is facing the prospect of losing it to foreclosure, sees this as a solution to the problem and makes a deal with the cereal company for support, not understanding that it is Dexter's formula that gives the product its miraculous properties. And things are further complicated when criminals are brought into the mix.