Created by Luke Short and Charles A. Wallace, Zane Grey Theatre was originally based on the short stories and novels of Western author Zane Grey, but as the episodes continued, new material was included [REF].
In addition, Wanted: Dead or Alive, with Steve McQueen playing the bounty hunter Josh Randall, was a CBS spinoff of Trackdown, and Law of the Plainsman, starring Michael Ansara as a Harvard-educated, Native American U.S. Marshal, was an NBC spin-off of The Rifleman.