The Return of Doctor X (1939) trailer

Using climax to a revolutionary medical discovery, its terrible power is delivered into the ruthless hands of a man the world once destroyed. A revenge-hunted genius, taking his name from the unknown inferno from which he returns.

Dr. X. A mark of a mad man who lives to kill, and who must kill to live. Doctor Xavier? Yes, I am, Dr. Xavier. You can't be. I'll be very careful. I've always been careful, even though I have to kill.

You're the best human! Told them about me. I didn't have to be found out for themselves.

You're lying! I see, no, everything. No, only that I brought you back to life. I should really kill you, Frank, for what you've done to me. Only give me a full longer. One week. That's all.

There's a killer, Lucin, the city, and you can help us find him. I told you I don't know anything. What about that bullet cane? What about cane? My work ended not in failure, but in disaster.

Disaster for me? Disaster for Mr. Rex. The necessity for additional transfusions of human blood became increasingly frequent. Gentlemen, I am responsible for the...