You know the intro:
"Faster than a speeding bullet! More powerful than a locomotive! Able to leap tall buildings in a single bound!"
The Adventures of Superman ran for six seasons (1952-8), becoming the first series based on a DC Comics book to be adapted for television. At a time when the Man of Steel was legitimately DC's #1 attraction, something that isn't the case anymore, Superman deviated from the usual comics format in that Superman (George Reeves) fought only gangsters, con artists, and the occasional mad scientist. None of his arch-enemies, such as Lex Luthor, would appear on television until Filmation's animated adaptation came along, eight years after the series ended.
As a result, the supporting cast was more of a repertory company, as actors were used in various roles on a recurring basis. Future TV stars such as Leon Askin (Hogan's Heroes) and The Rifleman's Chuck Connors & Paul Fix (in separate episodes) made early appearances. Askin appeared at least twice. For voice actor devotees, Herbert Vigran, a frequent player for Hanna-Barbera in the 50's & 60's, made a few appearances as various gangsters, and Sterling Holloway, years before being the original voice of Winnie The Pooh, played a well meaning scientist.
My first exposure to the series came when it aired in syndication in the 70's. I barely remember seeing it locally, but it was part of a swank afternoon block on WPIX that was an action lover's dream, as Superman would be bracketed in between Batman & Lone Ranger, with Gilligan's Island at the end of a 2 hour block.
Edit: 9/20/14: The episode previously posted here was deleted by YouTube due to copyright issues. In its place is a promo, produced in color in 1966. Many of us have seen this during the series' run in syndication in the 70's.