Trekkie Trouble
Paul Fix also appeared in the pilot of Star Trek in the role of Dr. Mark Piper. When the sci-fi show got picked up by the network, DeForest Kelley took over the role. The weird thing was that they moved the initial pilot episode to the third episode, so Dr. McCoy was the ship physician before Dr. Piper.
Sammy Davis Jr.
Sammy Davis Jr. of Rat Pack fame starred in two The Rifleman episodes: “Two Ounces of Tin” and “The Most Amazing Man.” He portrayed the sharpshooter Tip Corey and cowboy Wade Randall. Among other things, the fans liked his shooting and spinning skills.