The Unearthly.

Dr. Charles Conway (John Carradine) is surreptitiously experimenting with artificial glands to try to create longevity. Conway receives his test subjects through an associate, Dr. Loren Wright, who delivers patients seeking treatment for lesser conditions. Wright delivers his newest find, Grace Thomas (Allison Hayes) and Frank Scott (Myron Healey) to the psychiatric institute. Scott attempts to conceal his identity, but Conway deduces he is an escaped convict from his description in the newspapers and a telltale tattoo on his wrist.