Villain(s)  Body doubles, Martians

Actor(s):  Kent Taylor, Marie Windsor, William Mims, Betty Beall

Brief Description  The Day Mars Invaded Earth (1962) is a low-budget sci-fi thriller directed by Maury Dexter and starring Kent Taylor as Dr. David Fielding. Despite its dramatic title, the film features no large-scale military invasion; instead, invisible energy-based Martians use doppelgängers to systematically replace a scientist and his family as a defensive measure.

Plot:
The film opens at Cape Canaveral, Florida, where Dr. David Fielding and Dr. Web Spencer successfully launch the "Mariner B" rocket, dropping a capsule onto the surface of Mars. The robotic rover moves across the Martian soil, collecting data and transmitting high-gain radio signals back to Earth. Suddenly, a massive, unexplainable surge of pure energy overrides the transmitter, causing the rover to burst into flames and explode. Puzzled by the intense radio signals recorded just before the explosion, David decides he needs a break. David travels to Los Angeles to reunite with his family. Because his work has consumed his life, his wife, Claire, is highly resentful and actively considering a divorce. To give their marriage one last chance, the family stays at a sprawling, isolated luxury estate owned by Claire's wealthy family. The atmosphere is tense and distant.

Shortly after moving into the mansion, eerie and inexplicable events begin to occur. Family members begin catching glimpses of one another in two places at once: Claire spots David walking around the grounds when he is actually asleep in bed. The children, Judi and Rocky, encounter exact lookalikes of themselves and their mother wandering the estate's massive gardens.Footsteps echo through empty hallways, and the main electronic security gate inexplicably malfunctions, trapping the family inside the isolated grounds. Initially, they dismiss these sightings as hallucinations brought on by stress and family anxiety. However, as the doppelgängers grow bolder, the family realizes they are being actively hunted.

David eventually confronts his own body double inside the mansion. The duplicate calmly reveals the terrifying truth: Mars is inhabited by an advanced, body-less intelligence made of pure energy. The Martians did not desire a planetary war, nor did they plan a grand invasion. Instead, they were acting strictly in self-defense. Viewing the human probe as a direct threat to their security, they hitched a ride back to Earth by converting themselves into data and traveling along the probe’s high-gain radio signal. To stop humanity from ever launching another mission to Mars, they plan to systematically replace key space scientists with identical energy duplicates who will sabotage future exploration. Because David's wife and children would easily recognize that the fake David was an imposter, the Martians must replace his entire family as well. Family friend and fellow scientist Web Spencer arrives at the estate and successfully repairs the malfunctioning electronic main gate.

Before he can leave or alert authorities, he is intercepted by the Martian double of David. The alien duplicate uses a localized energy surge to instantly vaporize Web, reducing him to a pile of ash. Web is immediately replaced by a Martian copy. In the film's famously bleak and chilling ending, the "Fielding family" is shown happily piling into their station wagon. The duplicate Web is behind the wheel, and they smoothly drive out of the open estate gates to integrate into society. As the car drives away, the camera pans down into the estate's empty, concrete swimming pool. Lying on the floor of the pool are five human-shaped piles of gray ash—the remains of David, Claire, Judi, Rocky, and Web. The pool's automatic water jets suddenly click on, slowly and completely washing the ashes down the drain, erasing all evidence that the real family ever existed. The Martian infiltration of Earth's space program is a silent, flawless success.