Trivia / Just Imagine

• Fake Nationality: El Brendel, who plays the Swedish Single-0, wasn't actually Swedish.
• Prop Recycling: Stock Footage of the cityscape was later used in the Universal film serials Flash Gordon and Buck Rogers, while Z-4's Rocket Plane was recycled as Zarkov's rocketship. Publicity stills appear in countless books on science fiction, where they are sometimes mislabeled as being from Metropolis.
• What Could Have Been: Hollywood assumed from this disaster that "Science Fiction" wasn't a big money maker. It wasn't until The '50s that they were willing to risk another blockbuster with Destination Moon, and 1975 before another sci-fi musical came out with The Rocky Horror Picture Show.