Classic 1950's Sci-Fi TV
Rocky Jones, Space Ranger is an American science fiction television serial originally broadcast in syndication from February to November 1954. The show lasted for only two seasons and, though syndicated sporadically, dropped into obscurity. Because it was recorded on film rather than being broadcast live as were most other TV space operas of the day, it has survived in reasonably good condition. The film format also allowed more elaborate special effects and sets, exterior scenes, and much better continuity. https://en.wikipedia.org/wiki/Rocky_Jones,_Space_Ranger
Captain Midnight (later rebranded on television as Jet Jackson, Flying Commando) is a U.S. adventure franchise first broadcast as a radio serial from 1938 to 1949. The character's popularity throughout the 1940s and into the mid-1950s extended to serial films (1942), a television show (1954–1956), a syndicated newspaper strip (1942-late 1940s), and a comic book title (1942–1948).
Flash Gordon is a science fiction television series based on the King Features characters of the Alex Raymond-created comic strip of the same name. A total of fourteen episodes are currently available in the public domain, both on various DVD releases and on websites; Episodes 1, 5, 6, 8, 10, 17, 19, 20, 21, 22, 24, 25, 36, and 39. https://en.wikipedia.org/wiki/Flash_Gordon_(1954_TV_series)