
Professor Gordon has discovered that Earth is on a collision course with the previously unknown planet Mongo, sending cities into pandemonium, but Gordon hopes that Dr. Zarkov will be able to use his new rocket ship to reach Mongo and alter its course. Gordon's son Flash, a professional polo player, is flying home when his plane runs into dangerous conditions caused by Mongo's approach and the passengers are all given parachutes and told to bail out. Flash and Dale Arden, the young woman seated next to him, land in a field that just happens to be where Zarkov's ship is getting ready for takeoff. Zarkov takes the two with him to Mongo where they are taken to the throne room of Emperor Ming who has planned Earth's extermination. Zarkov plays up to Ming's egotism by suggesting he conquer the Earth rather than destroy it (allowing the earthlings to try and thwart his plans). Thus begins this 13-chapter serial from Universal which, based on a popular comic strip, is the granddaddy of science fiction serials. Along the way, Flash and his pals meet up with a number of colorful characters. Princess Aura, Ming's daughter, starts out as a villain with plans to claim Flash for herself and get rid of Dale, but after numerous plots of hers are foiled and she is betrayed by her father, she comes around to helping the earthlings out of various traps. Prince Thun, long-bearded leader of the Lion Men, who fly through the skies in small vehicles called gyros, becomes an ally. King Kala of the Shark Men (actually just humans who live in an underwater city) makes Flash battle a large octopus and might have turned into an ally, but after the underwater city is destroyed, his fate is left up in the air, so to speak. King Vultan and his Hawkmen, who have gigantic wings which appear to be part of their costumes rather than natural appendages, and live in a floating city in the sky, are enemies of the Lion Men. Vultan captures Dale, wanting her for his queen, and even subjects Flash to electrical torture, but eventually joins up with Flash and Thun and becomes very helpful (despite his bizarrely hearty laugh which sometimes sounds downright creepy). Finally, Prince Barin, rightful heir to the Mongo throne, throws in with our group to help, if Flash will help Barin get rid of Ming.
There are a number of fun things about this serial, and the fairly large number of characters is a definite plus. None of the men are allowed to be as handsome and hunky as Flash; Vultan and Barin are sort of beefy, in an out-of-shape way. The two women (in fact, the only women in the entire movie with speaking parts) are sexy—Dale is blond and innocent, Aura is dark and exotic. The action is non-stop; it all seems to be taking place in one long time period, as there are no day or night time markers except for one scene set at midnight. Unlike most later serials, there are few fistfights but several scenes of combat. In addition to the octopus, Flash grapples with an orangopoid (giant ape), wrestles mutants, engages in a Tournament of Death swordfight with a masked champion, tussles with a Sacred Tiger, and faces a giant lobster-clawed creature and a fierce Fire Dragon. He also gets drugged, has his memory wiped, is turned invisible, is stripped down to work in the atom furnaces (where he leads a mutiny), and is tortured by electric shock in the Static Room.
The sets are spectacular, many of them recycled from earlier Universal horror movies. An impressive but utterly unnecessary scene of orgiastic dancing is pulled from the 1930 sci-fi comedy
Just Imagine. The miniature effects involved in showing flight are primitive but charming, especially a short scene featuring the flying Hawkmen. There are a few weaknesses. It wasn't always clear to me where scenes were taking place, and the whole Shark Men sequence is a bit boring. Princess Aura, who toggles between good and bad, suddenly decides in chapter 12 that she's in love with Prince Barin, an unmotivated change that rings false. And Ming's plan to conquer Earth is never really brought up after the first chapter; mostly, he wants to force Dale to be his bride. [Slight spoiler: we are told that Ming basically commits suicide in the end—in a fairly effective scene—but this is left ambiguous so Ming can return in any sequels, which he does.]
Serials don’t require great actors. Best is Buster Crabbe as Flash; mostly, he looks either scared or uncomfortable, though he is an effective hero and looks good in his tight shorts (and even better in his shirtless scenes). Richard Alexander is quite good as Barin and Jack Lipson is fine as Vultan. The rest of the main cast is fairly weak. Some critics like Charles Middleton as Ming, but aside from his Fu Manchu-ish look, I found him artificial and somewhat low energy. Jean Rogers (Dale) is often reduced to shrill screaming, yelling Flash's name, and fainting; Priscilla Lawson has resting glower face as Aura. Frank Shannon is ineffectual as Zarkov, and it doesn’t help that the 62-year-old actor has to wear a shorty-shorts costume that makes him look pretty silly. Theodore Lorch deserves mention as Ming's high priest who skulks about a lot. Despite its age, this really is a high point of the serials genre; by the 1940s, budgets got cheaper, scriptwriters got lazy, and action scenes got repetitive. Don't get me wrong, I enjoy the serials of the classic era, and cheap thrills can be had from even the worst ones, but if you're looking for the best the genre has to offer, this will do. BTW, the movie was given a subtitle, Space Soldiers, in the 50s when it was sold to TV, and that subtitle is on most of the home video versions, though never onscreen. In 1966, a condensed version called Spaceship to the Unknown was released to television, cutting the four hour serial down to 100 minutes, leaving out entire subplots like the Shark Men adventure, but it remains fairly coherent. [DVD]