As Admiral Kirk and company disobey direct orders, setting out to learn the truth about Spock's fate and the effect it's having on Dr. McCoy, they encounter a renegade Klingon commander who plans to steal the secret of the Genesis torpedo and use itfor his own evil purposes, in "Star Trek III: The Search for Spock" (1984). William Shatner, DeForest Kelley, Christopher Lloyd star; directed by Leonard Nimoy. Three-disc set also includes "Star Trek II: The Wrath of Khan" and "Star Trek IV: The Voyage Home." 5 1/2 hrs. total. Widescreen; Soundtracks: English Dolby Digital 5.1 EX, French Dolby Digital stereo, Portuguese Dolby Digital mono, Spanish Dolby Digital mono; Subtitles: English, French, Portuguese, Spanish; audio commentary; featurettes.