Star Trek III: The Search for Spock is a 1984 motion picture released by Paramount Pictures. The film is the third feature based on the Star Trek science fiction franchise.thumb|300px|right
The Starship Enterprise limps back to Earth following a battle with the genetically-engineered super human 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 orbit around the planet created by the Genesis Device. On arriving at Earth Spacedock, Doctor Leonard McCoy begins to act strangely and is detained. Starfleet Admiral Morrow visits the Enterprise and informs the crew the ship is to be decommissioned; the crew is ordered not to speak about Genesis due to political fallout over the device.
David Marcus—Kirk's son, a key scientist in Genesis' development—and the Vulcan Saavik are investigating the Genesis planet on board the science vessel Grissom. Discovering an unexpected life form on the surface, Marcus and Saavik transport to the planet. They find that the Genesis Device has resurrected Spock in the form of a child, although his mind is not present. Marcus admits that he used unstable "protomatter" in the construction of the Genesis Device, meaning that Spock is rapidly aging and the planet will be destroyed within hours. Meanwhile, Commander Kruge, a member of the Klingon race, intercepts information about Genesis. Believing the device to be a potent weapon, he takes his cloaked ship to the Genesis planet, destroys Grissom, and captures Marcus, Saavik, and Spock.
Spock's father, Sarek, confronts Kirk about his son's death. The pair learn that before he died, Spock transferred his katra, or living spirit, to McCoy. Spock's katra and body are needed to lay him to rest on his homeworld, Vulcan, and without help McCoy will die from carrying the katra. Disobeying orders, Kirk and his officers spring McCoy from detention, disable USS Exelsiar, and stealEnterprise from Spacedock to return to the Genesis planet.
In orbit, Enterprise is attacked and disabled by Kruge. In the standoff that follows, Kruge orders that one of the hostages on the surface be executed; David is killed defending Saavik. Kirk and company feign surrender and activate Enterprise's self-destruct sequence, killing the Klingon boarding party while the Enterprise crew transports to the planet's surface. Promising the secret of Genesis, Kirk lures Kruge to the planet and has him beam his crew to the Klingon vessel. As the Genesis planet disintegrates, Kirk and Kruge engage in hand-to-hand combat; Kirk emerges victorious after kicking the Klingon off a cliff. Overwhelming the last member of the Klingon crew, Kirk and his officers set course for Vulcan.
Spock's katra is reunited with his body in a dangerous procedure called fal tor pan. The ceremony is successful and Spock is resurrected alive and well, though his memories are fragmented. At Kirk's prompting, Spock remembers he called Kirk "Jim" and recognizes the crew.