Jim Varney returns as the lovable but brainless Ernest. Here he is Chippewa Falls school bus driver. But he is totally stupid. So the school board decide that he must go back to school to take his exams again and if he passes he keeps his bus driving job. If he fails the exams, he loses his job. But his only friends there are two mad science teachers who help boost his IQ a little, and and members of the marching band.