The film includes a pair of Captain Kirks - William Shatner (original Captain Kirk from Star Trek (1966)), Chris Pine (2009 Captain Kirk from Star Trek (2009)); and a pair of Darth Vaders - James Earl Jones (voice of Darth Vader in all 4 film appearances) and Hayden Christensen (Darth Vader in suit from Star Wars: Episode III - Revenge of the Sith (2005)).