At home in California 's High Sierras , Prof. Clifford Groves ( Robert Shayne ) hears glass breaking .
At home in California 's High Sierras , Prof. Clifford Groves ( Robert Shayne ) looks up in fear from his book , Neanderthal Man and the Stone Age .
At home in California 's High Sierras , Prof. Clifford Groves ( Robert Shayne ) hears glass breaking and looks up in fear from his book , Neanderthal Man and the Stone Age .