Bonanza and Star Trek are deeply intertwined.
The original ’66 Star Trek had almost every primary actor appear on Bonanza at some point: Leonard Nimoy, William Shatner, George Takei, James Doohan and more.
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Michael Landon blocked new characters from being added to the show.
During the final couple seasons of Bonanza, star Michael Landon refused to allow any new characters onto the show. This caused major blow ups between Landon and the production team. Diva, much?