"Kool Fu Mo Gee"'s got a device/weapon/thingy that, far away, in tropical waters creates an iceberg and makes an ocean liner run into it. You see, Fu has captured one "Professor Heracles" inventor of a super weapon - crystals made from opium that can, depending on plot requirements, render people unconscious and/or turn the entire ocean into ice. Yes. Fu broadcasts his demands to the world. Scotland Yard intercepts the message and puts agent Nayland Smith (the very bland and doughy Richard Greene) on the case. Smith opines that Fu must be stopped or "mankind will be obliterated". Really?