 In order to prepare for the role, Cross drew on his experience as a parent as well as Sarek's previous on-screen appearances.Having been present when his daughter was born, he was able to 'call on all sorts of things' in the scene where Amanda has baby Spock, a scene which did not make it into the theatrical cut of the film.While he found the emotionless trait of a Vulcan a challenge to play, he found the father/son relationship between Sarek and Spock easier to play.