The Devil Bat (1940)
Dr. Carruthers former employers became rich thanks to his invention. Needless to say Dr. Carruthers didn't receive any credit for it and now he is fuming mad. But thanks to his evil genius, he has just the plan to extract his revenge. Guided by a special perfume he designed wore by his intended victims, Dr. Carruthers sends out giant killer bats to do his bidding. One by one, his betrayors are killed by the demonic beasts until local reporter Johnny Layton figures out the nefarious plot. But is he too late?