Flying Saucers of Death!
Storyline: Mysterious sightings of flying saucers, especially in California, where the saucers appear to be much larger than in the rest of the country, and an explosion of one causing serious fatalities, spurs Captain Albright to investigate. He discovers that the "saucers" are radio-controlled discs that are radioactive and highly explosive, and that Dr. Osmosis is behind them.