Colonel Mattock, an old cattle baron, wants to rid the region of the Pinto Basin nesters. He is unaware, however, of his foreman's activities for his own selfish purposes.

Big Jim Moran, former town bum, has struck it rich with a uranium mine, thus inspiring Pat Brady to sell Nellybelle and purchase a geiger counter. Unfortunately, both Moran and Pat are attacked by a vicious gang of claim-jumpers.