The Return of Doctor X

Humphrey Bogart regarded this as his biggest dog of a film. He plays a mad scientist who went to the electric chair, died, was revived with "synthetic blood," then had to subsist by draining the blood of others.

And here's the weirdest thing: almost every scene in this trailer is an outtake, not seen in the actual film! I wonder if viewers of the era felt ripped off.

'Nuff said!