Dr. Cameron (George Zucco) has succeeded in his experiments with a serum which will turn a man into a wolf-like monster and is ready to avenge himself on the men who caused his professional failure. He uses it on his gardener Petro (Glenn Strange) and one after the other is killed by his creation. His daughter, Lenora (Anne Nagel), grows suspicious and confides with newspaper reporter Tom Gregory (Johnny Downs).
Ellen has been taking care of her insane younger sister Cissy ever since their explorer father died. When Cissy's pet ape dies in their mansion's dungeon and Ellen finds a boyfriend, Cissy's incestuous desire for her sister turns deadly.
The story of the defense of the mission-turned-fortress by 185 Texans against an overwhelming Mexican army in 1836.
Heidi is still the same lovable little girl she's been for almost 100 years in a tender story of love, laughter and hope. Your whole family will love 'The New Adventures of Heidi.'