
Scientists from a research group in Oasis, New Mexico called Science Associates (SA) are dropping like flies in suspicious accidents, but we know they are the work of Dr. Vulcan, whom we only see in shadow. In one case, Prof. Drake is driving a car which is taken over remotely by Vulcan and driven over a cliff. In the latest incident, we see Prof. Millard get a verbal warning through a speaker about his death, followed by an explosion in which Millard is assumed dead. But he survives and is whisked away to a secret lab by Jeff King, one of the SA scientists, who suspects that another SA scientist is actually Dr. Vulcan. Millard continues his work on several inventions, including an atomic-powered jet pack (with a mask and control dials that say Up, Down, Fast and Slow) that will allow a man to fly through the air. King, keeping Millard in hiding, goes back to the SA board, now down to only six, and is appointed to investigate the mysterious deaths. He gets help from Burt Winslow, SA's PR man, and reporter Glenda Thomas. When a gang of Vulcan's thugs led by Dirken steal an experimental missile, Jeff dons the jet pack, flies up in the air after the missile is fired, and manages to shoot it down before it causes harm. The heroic flier comes to be known as Rocket Man, though no one except Millard knows his identity. Jeff comes to suspect Conway, the head of SA, as being a bad guy; he is but he's not Vulcan, and as he's about to tell who is, Dirken throws a knife at him. Attempts are made to steal Millard's Decimator which can melt rocks and earth, as we see in an impressive cave incident which, surprisingly, proves fatal to one of our good guys. Eventually Vulcan and Dirken get their hands on one and threaten to destroy New York City with a massive tidal wave unless they get ransom money. Can Rocket Man save the day?

Many of the more popular classic-era serials (multi-chapter adventures which could total up to over three hours) were eventually edited down to shorter feature-length films, often for showing on television. As an experiment, I decided with this serial from Republic to watch the short distillation (LOST PLANET AIRMEN) first and compare the two. For starters, both titles are quite misleading. There are no Rocket Men (ort Airmen), just a Rocket Man. He's also no one's king (though his last name is King). There is no Lost Planet involved, just Earth. AIRMEN, which is just over an hour, is fast-paced, filled with action, and is relatively coherent. ROCKET MEN, at twelve chapters, is almost three hours and has the burden of providing a cliffhanger at the end of each chapter. AIRMEN cuts out a few chapters, discarding entire subplots, including one that involves the death of an SA scientist who in AIRMEN just disappears, and Glenda suspecting that Jeff is Vulcan. An entire contraption, the Sonitron, is also missing from the shorter movie. Perhaps the biggest change is at the climax. In ROCKET MEN, the tidal wave does, in fact, destroy Manhattan, with good use made of some impressive special effects scenes from the 1933 film DELUGE. The good guys still rejoice, presumably because Vulcan is killed, and the mayor proclaims that the city will rebuild (and, despite the large-scale destruction, we see there are somehow still plenty of skyscrapers still standing outside the mayor's window). In AIRMEN, Vulcan is stopped before he can inflict much damage, and the DELUGE scenes are shown merely as the imaginings of Vulcan as he plots his evil deed.
Though the later-era serials are usually considered inferior to those of the 30s and 40s, this one is still enjoyable enough. The full serial conforms to the typical formula, with cliffhangers and fisticuffs in each chapter, generally bland characters, and a posse of bad guys in suits who are rarely differentiated from each other. Famous stunt man David Sharpe (pictured at right) does stunts here (and very well) but also has a role in a couple of chapters as a bad guy. The identity of Vulcan is, as I expected it would be, a disappointment, like the writers chose him randomly from the SA board, but Dirken, the chief thug, is well played by Don Haggerty. Tristram Coffin, often a movie villain, is Jeff, and is adequate if not compelling—in stunt scenes, it's Sharpe in the masked Rocket Man outfit. Mae Clarke (from FRANKENSTEIN and THE PUBLIC ENEMY) and House Peters Jr. are better as Jeff's sidekicks, and luckily one or both is almost always present. Clarke gets to throw a punch at a thug and Peters gets a nice bound-and-gagged scene near the end. James Craven is very good as Millard, putting a bit of life into the stock role of the helpless scientist—in the full serial, he briefly gets to wear the jet pack! Some fun lines: when the Sonitron is destroyed, Millard takes it like a champ, saying jauntily, "Well, we can build another one!"; when King reveals he's the Rocket Man, Dirken replies, "Yeah, and I'm the King of Siam!" Even though some major storylines are absent from AIRMEN, I think I liked that better, and I'm surprised at how complete it felt. Republic made two more Rocket Man movies and one TV series using the same costume but with different lead characters, including two with Commando Cody, which I'll get around to watching soon. Finally, I’d be remiss if I didn’t mention that these films inspired the naming of the 70s band Commander Cody and His Lost Planet Airmen, best known for their 1971 cover of the novelty song "Hot Rod Lincoln." Unofficially known by serial fans as Rocket Man 1. [Blu-ray]