Robert Shayne, Richard Crane, Joyce Terry, Doris Merrick, Robert Long, Tandra Quinn, Beverly Garland, Dick Rich, Lee Morgan, Frank Gerstle, Robert Easton, Eric Colmar, Robert Bray, Anthony Jochim, Marshall Bradford
A scientist develops a formula which will cause animals to regress to the form of their primitive ancestors, and tries it on himself with disastrous results.