"[to Terence Granville, who is strapped to an operating table] This serum, distilled from dragon's blood, my own blood, the organs of different reptiles, and mixed with the magic brew of the sacred seven herbs, will temporarily change you into the living instrument of my will. You will do as I command!"

"I have seen a vision, the prophecy is about to be fulfilled. Genghis Khan, masked in his plate of gold, bearing the scimitar that none but he could ever wield comes back to us. I've seen a vision of countless hordes swarming to recapture the world. I've seen them victorious. I've heard the shouts of the dead and the dying drowned by the victorious cries of our people. Genghis Khan comes back! Genghis Khan leads the East against the world!"

"[to Sheila Barton and Dr. von Berg] Silence! It is my pleasure to show you how I entertain my guests. You, Miss Barton, will be taken to the Room of the Golden Peacock, where you will be prepared as a sacrifice to our gods! And you? You, my dear doctor, will follow my slaves to the Room of the Slim Silver Fingers, where I am sure you will be more than comfortable! And at sunrise tomorrow, as my chieftains are assembled in the temple below, you two, and your compatriot, Sir Nayland Smith, will have the pleasure of entering your Christian heaven together! It will be your honor to be the first white martyrs to perish at the hands of the new Genghis Kahn! I congratulate you!"

"The Frankenstein of the Orient!"

"I am a doctor of philosophy from Edinburgh, a doctor of law from Christ's College, a doctor of medicine from Harvard. My friends, out of courtesy, call me 'Doctor'."

"[to horde of Asians] Men of Asia! The skies are red with the thunderbolts of Genghis Khan! They rain down on the white race... and burn them!"

"Boris Karloff — Dr. Fu Manchu"

"[to Sir Lionel Barton, describing the "Bell Torture"] You've read about this, Barton: the torture of the bell: it never stops. Minute after minute, hour after hour, day after day. Seems harmless, doesn't it? Just a bell ringing. But the percussion and the repercussion of sound against your eardrums will soften and destroy them until the sound is magnified a thousand times. You can't move. You can't sleep. You will be frantic with thirst. You will be unspeakably foul. But here you will lie, day after day, until you tell."

"Dwight Frye — Professor Anderson"

"Lewis Stone — Sir Denis Nayland Smith"

"Who killed John Woodford?"

"Lawrence Grant — Sir Basil Courtney"

"Harold Minjir — Rogers"

"Holmes Herbert — Sir John Petrie"

"Nicholas Soussanin — Morloff"

"E. Alyn Warren — Lu Chung"

"Frances Dade — Joan Marshall"

"The Arch-Fiend Lives Again!"

"Howard Marion-Crawford — Doctor Petrie"

"Günther Stoll — Dr. Curt Kessler"

"Anna May Wong — Princess Ling Moy"

"Christopher Lee — Fu Manchu"

"Rosalba Neri — Lisa"

"Warner Oland — Dr. Fu Manchu"

"Richard Greene — Nayland Smith"

"The entrance to eternity. Beyond that door there is a tunnel which leads directly to the sea. Cisterns of water are poised above it. The touch of a lever will release hundreds of thousands of gallons of water into that tunnel, and combined with professor Heracles' crystals this can transform the entire sea into one gigantic block of ice."

"The formula. With this I can control all things - and all men."

"I have brought you here to save the life of someone whose knowledge I require as a thirsty man needs water. Crystal clear water, doctor Kessler. The name of the person to whom I refer is professor Heracles."

"This is Fu Manchu. Once again the world is at my mercy. I have conquered not only the mysteries of the continent but now of the oceans too. In the tropical waters of the south Atlantic my hand stretches out to turn water into ice - and to transform safety into the deadliest peril. In a few moments the proof of my mastery will be complete."

"Sessue Hayakawa — Ah Kee"

"He's Back!!! The World's Most Evil Man with a Fiendish Plan of Conquest"

"Maria Perschy — Dr. Ingrid Cox"

"Tsai Chin — Lin Tang"

"Werner Aprelat — Melnik"

"Bramwell Fletcher — Ronald Petrie"

"Jose Manuel Martin — Omar Pasha"

"Yoshio Kosugi — Inao"

"Kaoru Yachigusa — Fujichiyo Kasuga"

"Yoshio Tsuchiya — Mizuno"

"Tatsuya Mihashi — Kenji Okamoto"

"Keiko Sada — Kyoko Kouno"

"Is he a demon, or a spawn of space? The Gas Man challenges for the perfect crime!"

"Born of Woman...Re-created by Outer Space!"

"Hisaya Ito — Dr. Tamiya"

"Yoshifumi Tajima — Tabata"

"Joe King — Detective"