As Dr. Ernest Sovac (Boris Karloff) makes his way to the electric chair, he recalls the events that landed him on death row. After placing brain matter from a violent gangster into the mind of a dying teacher named George Kingsley (Stanley Ridges), Sovac watches his patient take on violent tendencies. When Sovac learns, through an almost-possessed Kingsley, about a hidden stash of mob money, the doctor entices the criminal in Kingsley to come out -- with murderous results. Wikipedia
As Dr. Ernest Sovac (Boris Karloff) makes his way to the electric chair, he recalls the events that landed him on death row. After placing brain matter from a...