A strange animal attack turns a botanist into a bloodthirsty monster.

Henry Hull
as Dr. Wilfred Glendon

Warner Oland
as Dr. Yogami

Valerie Hobson
as Lisa Glendon

Lester Matthews
as Paul Ames

Lawrence Grant
as Sir Thomas Forsythe

Spring Byington
as Ettie Coombes

Clark Williams
as Hugh Renwick

J.M. Kerrigan
as Hawkins

Charlotte Granville
as Lady Forsythe

Ethel Griffies
as Mrs. Whack
John Chard
The werewolf is neither man nor wolf, but a Satanic creature with the worst qualities of both. Dr. Wilfred Glendon (Henry Hull) is in Tibet searching for the rare mariphasa plant that apparently only blooms under moonlight. Upon finding the plant his joy is obvious but it's quickly short lived as...