Fact1: scientist father After investigate David 's claim rushing to tell parents, Fact2: David are acting in exactly same way, Fact3: Kathy Wilson disappear underground while walking in child neighbor sandpit, Fact4: flying saucer is vanguard now in close orbital proximity to Earth, Fact5: Blake and David Standing well away from are sucked underground army search
Output: Late one night, youngster David MacLean Jimmy Hunt is awakened by a loud thunderstorm. From his bedroom window, he sees a large flying saucer descend and disappear into the sandpit area behind his home. After rushing to tell his parents, his scientist father Leif Erickson goes to investigate Davids claim. When his father returns much later in the morning, David notices an unusual red puncture along the hairline on the back of his fathers neck; his father is now behaving in a cold and hostile manner. David soon begins to realize something is very wrong: he notices certain townsfolk are acting in exactly the same way. Through his telescope, David sees child neighbor Kathy Wilson suddenly disappear underground while walking in the sandpit. David flees to the police station for help and is eventually placed under the protection of healthdepartment physician Dr. Pat Blake Helena Carter, who slowly begins to believe his crazy story. With the help of local astronomer Dr. Stuart Kelston Arthur Franz and Dr. Blake, David soon realizes the flying saucer is likely the vanguard of an invasion from the planet Mars, now in close orbital proximity to Earth. Dr. Kelston contacts the U.S. Army and convinces them to immediately investigate: An important government rocket research plant is located nearby. In short order, the Pentagon assembles troops and tanks under the command of Colonel Fielding Morris Ankrum. An alien sabotage plot at the plant is soon uncovered, leading back to the sandpit, and the army surrounds the saucer landing site. Standing well away from the army search, Dr. Blake and young David are suddenly sucked underground. They are captured by two tall, sliteyed green humanoids and taken via tunnels to the flying saucer. Army troops locate and blow open an entrance to the tunnels, and Colonel Fielding and a small detachment make their way to the saucer entrance. Inside, they confront the Martian mastermind: It has a giant green head with a humanoid face atop a small, green partial torso with several green armtentacles, and is encased in a transparent sphere. The Martian is served by the tall, green, silent, synthetic mutants. Under their masters mental commands, the mute humanoids have implanted mindcontrol crystals at the base of the skull of their kidnapped victims, forcing them to attempt sabotage at an atomic rocket project being built at a military plant near the town; if they are caught, the mind control devices explode, causing a fatal cerebral hemorrhage. The troops and Colonel Fielding, with Dr. Blake and David in tow, open fire on the pursuing mutants as their group escapes the saucer. After a short running battle in the tunnels, they return to the surface. Orders are given for everyone to quickly leave the area: Fieldings troops have planted timed explosive charges aboard the saucer. In an extended montage, David runs downhill away from the sandpit. As he does so, flashbacks of the films important events are superimposed over a closeup of his face, including scenes played backwards for surreal effect. These are intercut with alternating shots of artillery opening fire on the sandpit or closeups on the ticking timer slowly approaching zero. Following a large explosion, David is suddenly back in his bed. Thunder and lighting are heard again. He runs into his parents bedroom, confused and frightened; they reassure him that he was just having a bad dream, telling him to go back to sleep. Having returned to his bed, more wind and loud thunder is heard. David then climbs out of bed again, goes to his window, and witnesses the very same flying saucer of his dream slowly descending into the sandpit; the screen then holds on young David, who says Gee whizz, and then dissolves to the films The End title card, as the films ethereal music reaches its crescendo in coda with the final fadeout.