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 given a special tribute on the Special Edition DVD of Star Trek IV: The Voyage Home (1986), released in 2003.
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 wrote an issue of Star Trek: Deep Space Nine for Malibu Comics in 1995, that featured his Trek character Sarek, the issue being under Malibu's "Celebrity Series" line.
Mark did the narration for the "Federation" audio-book adaptation which served as the prelude to Star Trek: Generations (1994).
Mark met his wife, Ann Amouri, in acting class.
Mark's voice was featured on the "Star Trek Omnipedia" CD-Rom in 1995.
Mark narrated the audio-book version of the novel about his Star Trek character, Sarek (1994).
Mark did voice-over radio commericals for the Saab automobile company in the 1980s.
Mark wore glasses when off-camera, as he was far-sighted.
Mark was 6 feet tall.
Mark was the first actor to portray a Klingon with a ridged forehead, as well as speak the Klingon language developed by James Doohan and Marc Orkund, in Star Trek: The Motion Picture (1979).
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 wanted to appear in Star Trek II: The Wrath Of Khan (1982) but there was no part written for his character of Sarek or any major alien roles in the picture as well.
Mark was the first actor to play all 3 major alien races on Star Trek, as a Romulan, Vulcan, and a Klingon.
Mark Lenard: The screen captures your persona. It's not my personality, but it captures something in me that is there, something you cannot create or fake. That's something about acting: the camera catches something or it doesn't. Those who are successful are those who have been captured, who have presence and screen personality.