Released as part of "The Best of Superman Volume 3' along with "The Big Freeze' and the cartoon "Magnetic Telescope."
This episode was later adapted as a comic story, "The Menace from the Stars!" in World's Finest #68 (January 1954) and remade as episodes of Superboy (1988) and Lois & Clark: The New Adventures of Superman (1993), Superboy... Lost (1990) and All Shook Up (1994) respectively.
Jack Larson himself later stated in an interview that while filming the scene where Jimmy visits Clark at home (when he's in bed and not wearing his eyeglasses), Larson felt like going 'off script' and state that he recognizes Clark is really Superman. After announcing it to the crew, one crew member said to Larson "If someone accidentally/mistakenly opened a can of beans, you would not let it spill", then Larson stayed to script.
Early in the story, a scene shows the large astronomical observatory on Mount Palomar in California, with a cut to an astronomer looking through a telescope eyepiece. The observatory contains the 200-inch Hale Telescope. Actor Jonathan Hale plays the astronomer, Prof. Roberts. He is not related to actual astronomer and Caltech founder George Ellery Hale for whom the telescope is named, nor is the Hale Telescope designed for direct human viewing as shown in the story.