Captain Video and His Video Rangers was the first science-fiction space adventure program on television.  It premiered on the DuMont Network on June 27, 1949, and ran until April 1, 1955.  Although it combined many of the early staples of children's programming, such as the inclusion of inexpensive film clips and pointed moral lessons, Captain Video capitalized upon the public fascination with science and space and the technical elements of the new television medium to create the longest running science-fiction show in early television.
Set in the year 2254, the show was an ambitious undertaking — it was live, technically demanding, and programmed as a continuing serial appearing every evening from 7:00 to 7:30 P.M.  The show was designed to take advantage of the new technology: dissolves, superimpositions, and crude luminance key effects were utilized to place Captain Video in fanciful surroundings and allow him to travel through space and time.
As the "Master of Science," Captain Video was a technological genius who invented a variety of devices including: the Opticon Scillometer, a long-range, X-ray machine used to see through walls; the Discatron, a portable television screen which served as an intercom; and the Radio Scillograph, a palm-sized two-way radio. With public concerns about violence on television, Captain Video's weapons were never lethal but were designed to capture his opponents.  His arsenal included: the Cosmic Ray Vibrator, a static beam of electricity able to paralyze its target; an Atomic Disintegrator Rifle; and the Electronic Straitjacket, which placed captives in invisible restraints.
Captain Video comes close to being a lost series.  Only five 30-minute episodes, three featuring Richard Coogan and two featuring Al Hodge as the Captain, are available to the public in various video compilations.  DuMont destroyed almost all of its kinescope and Electronicam library in the late 1950s, thus nearly dooming all of its pioneering TV programs to oblivion.