Editing Spock (section)

===Death and resurrection===
Sometime after the V'Ger incident, Spock was promoted to captain and assigned to Starfleet Academy, where he trained cadets on the Enterprise, which had been retired from active service. 

 
The death of Spock in 2285.In early 2285, Spock ceded command of the Enterprise to Admiral Kirk during a mission that involved keeping the Genesis Device out of the hands of Khan Noonien Singh. When Khan armed the device after having been defeated by Kirk and the Enterprise, Spock sacrificed his own life by repairing the Enterprise's plasma conduits – in a severely irradiated portion of engineering – in order to save the crew. Following his funeral service, Spock's body was "buried" by being fired into space inside a torpedo casing. (Star Trek II: The Wrath of Khan) 

When Spock's coffin landed on the surface of the Genesis Planet, the radiation emanating from the planet caused his cells to regenerate. Meanwhile, Kirk and the rest of the Enterprise's senior staff disobeyed Starfleet orders so that they could retrieve Spock's body, and discovered that he had been reborn as a child (and was quickly aging to adulthood), but whose mind was a complete blank. On Vulcan, Spock's living body (now at the age it had been when he died) was reunited with his katra (the Vulcan soul), which Spock himself had placed in Dr. Leonard McCoy prior to his death. (Star Trek III: The Search for Spock) 

After his katra and body were re-integrated, Spock went on to serve as a Starfleet officer for many more years. He was involved in saving Earth from destruction by an alien probe in 2286. (Star Trek IV: The Voyage Home) 

Interesting note: Kirk honors Spock after his death in a toast with his senior staff in his apartment on Earth. "To absent friends" is the same toast Picard gives in Data's honor after his death. (Star Trek III: The Search for Spock; Star Trek Nemesis) 
[edit] The Enterprise-A
Prior to the launch of the new Enterprise, Spock was recruited to test the new brig as he was the most intelligent and resourceful person the designers could find. However, despite his ingenuity, he failed to escape. (Star Trek V: The Final Frontier)