When the evil Professor Twiny Vines plans to steal the Jurassic Corn Kernel at the county fair, Otis suits up as the Cowman to stop him. Unfortunately, things take a turn for the worse when the town mistakes Cowman as the thief. With the rest of the town hot on their heals, Cowman and his sidekick Ratboy must save their friends and stop Twiny Vines and his unsuspecting partner, Mrs. Beady.