The Brides of Fu Manchu (1966)

Fu Manchu and his army of henchmen are kidnapping the daughters of prominent scientists and taking them to his remote island headquarters. Instead of asking for ransom, Fu demands that the fathers help him to build a death ray, which he intends to use to take over the world. But Fu's archenemy, Sir Denis Nayland Smith of Scotland Yard, is determined not to let that happen.