Underrated early werewolf tale. A famous English botanist (Henry Hull) becomes a werewolf after a fateful expedition in Tibet. He goes back home and starts massacring Cockneys under the full moon. A few too many comic relief segments of gin-tipsy Brits hurt this a little, but the central story is entertaining.
The same make-up man who worked on this (Jack Pierce, who did all the early Universal monster movies) later created the more elaborate werewolf design in 1941’s The Wolf Man.