Dimension X was an NBC radio program that aired from April 8, 1950, to September 29, 1951. The show is considered a pioneer in the science fiction genre on radio, known for its adaptation of stories from renowned sci-fi authors such as Ray Bradbury and Isaac Asimov. It brought futuristic and imaginative tales to life through dramatization, often exploring themes of space travel, time travel, and advanced technology. "No Contact" is the fourth episode of Dimension X, originally aired on April 29, 1950. The storyline is set on June 2, 1987, and follows the journey of space explorers as they encounter a mysterious and fatal 'Galactic Barrier.' The episode explores the challenges and perils of space exploration, as six expeditions have already disappeared attempting to breach this invisible obstacle.