Glenda Thomas's photo won't enable Dr. Vulcan to see Jeff King's face under Rocket Man's helmet, but King is afraid of being identified by the particular rocket technology he and Professor Millard (James Craven) invented. (Evidently, a lot of men were building rocket-powered jet packs in 1949!) To retrieve the negative before it can be developed, King sets a trap to catch Dirken (Don Haggerty), but things don't go as smoothly as planned! (1949 - Republic Pictures)