This is the only Horror / Science Fiction film that actor Humphrey Bogart ever made. He said about it:
“This is one of the pictures that made me march in to Warner Bros. Studio Chief Jack L. Warner and ask for more money again. You can’t believe what this one was like. I had a part that somebody like Bela Lugosi or Boris Karloff should have played. I was this doctor, brought back to life, and the only thing that nourished this poor guy was blood. If it had been Jack Warner’s blood or Harry Warner’s or Sam Warner’s maybe I wouldn’t have minded as much. The trouble was, they were drinking mine and I was making this stinking movie.”
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