The Man They Could Not Hang (1939)

Mad scientist Dr. Henryk Savaard is obsessed with bringing the dead back to life. The police are alerted to Savaard's activities, however, and Savaard is arrested, convicted, and sentenced to hang. He vows revenge on the judge, jury, and district attorney. After the hanging, his assistant claims the corpse and uses Savaard's technique to bring the doctor back to life. Now the mad scientist can seek sweet revenge on his perceived "enemies".