Mr. Spock (Leonard Nimoy) has a curious limp in “The Cage,” Star Trek‘s original, rejected pilot, but the reason why is hinted at in the episode. Produced in 1964, “The Cage” was creator Gene Roddeneberry’s first vision for Star Trek. “The Cage” starred Jeffrey Hunter as Captain Christopher Pike, Susan Oliver as Vina, and Majel Barrett as Number One, along with Nimoy as the Vulcan Mr. Spock. NBC considered “The Cage” “too cerebral” for network television but ordered a second pilot that became Star Trek: The Original Series, with William Shatner’s Captain James T. Kirk replacing Pike and only Spock returning from “The Cage’s” cast.
https://screenrant.com/star-trek-original-series-pilot-spock-limp-explained/