Svengoolie S28E18 - Invaders from Mars (1953)

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Late one night, David MacLean, a young boy, is awakened by a loud thunderstorm. From his bedroom window, he sees a flying saucer descend and disappear into the sandpit area behind his home. He tells his scientist father George, who goes to investigate. David's mother Mary later looks for him there, but he is gone. When George returns in the morning, David notices an unusual puncture on the back of his father's neck; George is now behaving in a cold and hostile manner, and repeatedly warns David to tell no one about the saucer sighting. The police officers Mary summoned to find George are acting in the same way and say they will not report the incident since George has returned. Through his telescope, David sees child neighbor Kathy Wilson disappear underground while walking in the sandpit. When she returns, Kathy burns her family's house down.

David realizes his father and the others are being controlled by the alien visitors, and runs to the police station for help. The police chief, who also has a puncture on his neck, has David locked in a cell. Concerned by David's distraught manner, the desk officer summons health-department physician Dr. Pat Blake to calm him. Blake instead comes to believe David's story after she confirms several details, such as the police's neglecting to report George's disappearance.