Mad scientist turns a man into an electrically-controlled monster to do his bidding.

Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.

Hans Memling, a young intellectual, patriotic German, is secretly opposed to the Nazi regime. With the aid of Gustav Schultz, Father Pommer, Anna Wahl and others, he is gleaning accurate information from foreign radio broadcasts and distributing it through Germany with an underground-press operation.

Story of the early days of the diamond-mining era in South Africa.

In 1939, a group of Finnish soldiers defend the border from Russian invaders.

Tim MacGregor, unscrupulous lumber operator, obtains by bribery a contract to cut a vast quantity of timber from land owned by Kay Handley, rich débutante. When Dick O'Hara, forestry inspector, demands a postponement, MacGrgeor refuses and sends his henchman, Jean Collet, to obtain the services of the famous "bull-of-the-woods" Andy Jensen and his partner "Lucky." Kay arrives and gives her permission to cut the timber, defying Dick. Dick, with his two assistants, Withers and "Tex," begins a survey of the timber stand. When Dick and Tex finally reveal MacGrgeor as a crook, Collet is sent to kill "Tex" and obtain the reports. A fight ensues and "Lucky" is killed by one of Collet's flying knives. Kay then admits that Dick is right and helps him trap Collet. Dick and Andy force a confession from Collet and MacGregor is exposed.

A woman-hater who inherits a beauty salon gets a new perspective on females after capturing a gang of thieves.