Anybody remember Mark's performance as Sarek in Gene Roddenberry's Inside Star Trek
LP from the Seventies? He basically beams up to wherever Roddnberry is supposed to be and talks about Spock's early life and conception, and he just does a wonderful
job. It always struck me that when he eventually returned as Sarek in The Search for Spock
, it never seemed like he was coming back to play a character (for only the second time onscreen) that he had not played in over a decade - seeing him in his role seemed as natural as anyone else in the cast.