While on a botanical expedition in Tibet, Dr. Wilfred Glendon is attacked by a strange animal in the dark. After returning to London, he begins to transform nightly into a werewolf, terrorizing the city. His only hope for a cure lies in a rare Asian flower. Cast: - Henry Hull as Dr. 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 Miss Ettie Coombes - Clark Williams as Hugh Renwick - J.M. Kerrigan as Hawkins - Charlotte Granville as Lady Forsythe - Ethel Griffies as Mrs. Whack - Zeffie Tilbury as Mrs. Moncaster - Jeanne Bartlett as Daisy Runtime: 75 minutes