Star Trek III: The Search for Spock is a 1984 American science fiction film, written and produced by Harve Bennett, directed by Leonard Nimoy, and based on the television series Star Trek. It is the third film in the Star Trek franchise and is the second part of a three-film story arc that begins with Star Trek II: The Wrath of Khan (1982) and concludes with Star Trek IV: The Voyage Home (1986). After the death of Spock (Nimoy), the crew of the USS Enterprise returns to Earth. When James T. Kirk (William Shatner) learns that Spock's spirit, or katra, is held in the mind of Dr. Leonard "Bones" McCoy (DeForest Kelley), Kirk and company steal the decommissioned USS Enterprise to return Spock's body to his homeworld. The crew must also contend with hostile Klingons, led by Kruge (Christopher Lloyd), who are bent on stealing the secrets of the powerful terraforming device, Genesis.

Plot

The Federation starship returns to Earth following a battle with the superhuman Khan Noonien Singh, who tried to destroy the Enterprise by detonating an experimental terraforming device known as Genesis. The casualties of the fight include Admiral James T. Kirk's Vulcan friend, Spock, whose casket was launched into space and eventually landed on the planet created by the Genesis Device. Upon arriving at Earth Spacedock, Doctor Leonard McCoy begins to act strangely and is detained. The commander of Starfleet, Admiral Morrow, visits the Enterprise and informs the crew the ship is to be decommissioned; the crew is instructed not to speak about Genesis due to political fallout over the device.