Spock/Alternate realities/Kelvin timeline

Spock emerged from the black hole in the year 2258 of the alternate reality. Since Nero had emerged twenty-five years earlier, Spock was immediately intercepted by the Narada upon his arrival. Both Spock and the Jellyfish were captured by Nero who had been waiting for him. Spock's life was spared by Nero, although Nero marooned him on where he could witness the destruction of from the planet's surface. After Nero used some of the red matter from the Jellyfish to create a black hole in Vulcan's planetary core, Spock watched helplessly from Delta Vega as his homeworld was destroyed.
Shortly thereafter, Spock rescued a Starfleet officer from a hengrauggi, only to discover that the young officer was himself, that reality's having marooned him on the planet for mutiny. The elder Spock was surprised that Kirk was not captain of the Enterprise. When Spock heard from Kirk that Captain had been captured, Spock knew that Nero was responsible, describing the Romulan as "particularly troubled." Through a mind meld, Spock explained to Kirk his presence in this time period and the reasons behind Nero's actions.
He then walked with Kirk to the Starfleet Delta Vega outpost, where they met . Using Scott's equation for transwarp beaming (which Scott had not actually figured out yet), Spock was able to transport Kirk back to the Enterprise along with Scott. When asked why he would not come with them, Spock stated that his other self must not know of his existence, implying that it could cause some kind of temporal paradox. Knowing his younger self would never take the course of action that could stop Nero but that Kirk would, Spock instructed Kirk to use Regulation 619 to force his younger self to give up command to him by proving he was emotionally compromised. He informed Kirk he knew his younger counterpart was emotionally compromised due to the destruction of his homeworld. Kirk followed his advice and, by emotionally manipulating the alternate Spock, managed to take command of the Enterprise.
After the Enterprise defeated the Narada and Nero, the elder Spock returned to Earth. There, he met his less-than-surprised younger self (while Kirk had kept his word, his word was no match for even the intellect of the younger Spock, as he had figured out who Kirk's mysterious benefactor must be) and convinced him to remain in Starfleet. He also explained the reason he had not returned to the Enterprise with Kirk to explain things was that he had not wished to deprive Kirk and Spock of the chance of working together and developing the friendship they were destined to have. He then wished his younger self good luck and walked away.
Afterwards, Spock witnessed the official promotion of Kirk to captain of the USS Enterprise, repeating what he knew the crew would say before launch, apparently commiserating on his own experiences as a member of the crew of the Enterprise. He left with an intention to establish a Vulcan colony. His attempts to convince his younger self succeeded and the younger of the two Spocks returned to the Enterprise to act as Kirk's first officer. ()
A year later, Spock was living on New Vulcan, having made a solemn vow not to further interfere with history by keeping information about his experiences confidential. However, when the younger Spock contacted him for information regarding , the old Spock felt obligated to break his vow. He responded that Khan was the most dangerous adversary the Enterprise had faced, and that it had required a great sacrifice to stop him. 
Ironically, the younger Kirk later made the same sacrifice Spock himself had made when facing Khan in the prime reality to save the crew of the Enterprise, though he was revived. (; )
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