Paramount
While “Star Trek: The Next Generation” is set 100 years after “Star Trek: The Original Series,” some “TOS” cast members appeared on the show. In the pilot, “Encounter at Farpoint,” a 137-year-old Dr. McCoy (DeForest Kelley) visits the Enterprise-D and gives Data (Brent Spiner) some sound advice: “You treat her like a lady, she’ll always bring you home.”
Later, in the Season 3 episode “Sarek,” Mark Lenard guest-starred as the eponymous Vulcan ambassador, also known for being Spock’s (Leonard Nimoy) father. Spock himself then appeared in the Season 5 two-parter “Reunification,” where it’s revealed he’s moved to Romulus to try and bring the Vulcans and Romulans together again as one. After that, the former Enterprise Chief Engineer Scotty (James Doohan) appeared in the “Next Generation” Season 6 Episode “Relics,” having spent several decades trapped in a Dyson sphere. Finally,
