Though Mark's Vulcan character Sarek in Star Trek was supposedly several decades older than his Jane Wyatt's character Amanda, Sarek's human wife, it was actually Jane that was the older one in real life, being 14 years older than Mark.
Mark's role as Aaron Stemple in Here Come The Brides was parodied in Pocket Books Star Trek novel #23. "Ishmael," written by Barbara Hambly.
Mark had trouble wearing the armor his character Urko wore in the Planet Of The Apes tv series; it gave him a great deal of discomfort wearing both the make-up with the armor, which weighed up to 80 pounds depending on additions/accoutrements.
Mark was displeased with action figures made by Mego Corporation in 1974, with his likeness as gorilla General Urko from the Planet Of The Apes tv series.
Mark was only 7 years older than Leonard Nimoy when he portrayed Sarek, the father of Nimoy's character Spock, in the Star Trek tv series and movies.
One of Mark's favorite fan convention stories was about how he was recognized as the ape general Urko from the Planet Of The Apes TV series by a fan on the street--except he wasn't wearing his ape makeup at the time.
Mark was the first actor to play all 3 major alien races on Star Trek, as a Romulan, Vulcan, and a Klingon.
Mark was Desilu Studios' first choice to replace Leonard Nimoy when he considered leaving Star Trek after the first season.
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