Spock (alternate reality)/Starfleet career/Enterprise first officer/Nero

The hearing was cut short by the receipt of a distress call from , and Spock reported to the as first officer under Captain . En route to Vulcan, Spock once again clashed with Kirk, who had come aboard the Enterprise without authorization. Over Kirk repeatedly arguing that the distress call from Vulcan was the result of an attack by Romulans, Spock demanded that Kirk be removed from the bridge. However, when Uhura vouched for the accuracy of a crucial element of Kirk's claims, Spock decided Kirk was probably right, and as a result, Pike ordered the ship ready before dropping out of warp. Ultimately, arrival at Vulcan, which was under attack, proved that Kirk was correct, and contact was made with the Romulan mining vessel Narada, which was attacking the planet. When contact was established with the ship's captain, Nero, he appeared to know Spock, although Spock had never met the Romulan before. Pike, who was ordered to transport himself to the Narada, left Spock in charge as acting captain.
After the Naradas drill platform was disabled and Nero's plans were revealed, Spock beamed to the surface of Vulcan to at least rescue the Vulcan Council, including his father and mother. As the survivors were about to be beamed aboard the Enterprise, the disintegrating surface of the planet collapsed beneath Spock's mother, before the transport could be completed, and she died. She was one of almost six billion killed with the loss of the planet.
Struggling with the destruction of his homeworld and the death of his mother, Spock received comfort from . He decided to take the Enterprise to the Laurentian system – to rendezvous with the rest of the fleet – and engaged in a furious debate with Kirk, which led to Spock subduing the acting first officer with a Vulcan nerve pinch. Spock then ordered Kirk to be thrown off the ship, jettisoning him in an escape pod near .
With the Enterprise now at warp, Spock was surprised when Kirk and were able to beam aboard the ship, and demanded to know how they had been able to transport during warp. Kirk, who had by now met with a version of Spock who had traveled back in time with Nero, had also been told that in order to save Earth, he himself had to take over command of the Enterprise. The older Spock had asked Kirk to sufficiently provoke the younger Spock, in order to show everyone that he was too emotionally compromised to be in command. Kirk made several unsuccessful attempts to insult and cajole Spock, until finally a jibe about whether Spock had loved his late mother made the Vulcan snap, attacking Kirk and coming extremely close to killing him. He was only stopped by his father and, quickly realizing what had happened, he stepped down from command. Returning to the transporter room, Spock was comforted by the words of his father, who admitted he actually had married Amanda because he loved her.
After a brief cool-down period, Spock returned to duty, accepting Kirk's command, and approved of suggesting they could hide the Enterprise in Titan's atmosphere. Spock then volunteered to beam to the Narada, noting that the similarities between Romulan and Vulcan language and culture would help him in locating Captain Pike and determining a way to destroy the vessel. Kirk, now in command, agreed, and accompanied Spock aboard the Narada.
On the Romulan craft, Spock and Kirk engaged in a brief phaser fight with the Naradas Romulan crew. Mind melding with an unconscious Romulan crewmember, Spock was able to locate the and Captain Pike.
On board the Jellyfish, the computer recognized him as Ambassador Spock; when Kirk made an obviously sarcastic show of "surprise" and the computer stated that the ship had been built 129 years in the future, Spock realized exactly who Kirk had encountered on Delta Vega.
Attacking the Narada from the inside, Spock escaped into Earth's orbit, and was able to destroy the drill platform as it dug into San Francisco Bay. Ultimately, an artificially created black hole, with assistance from the Enterprises weapons, consumed the Narada and Nero, who had refused humanitarian assistance. Spock, angered over the destruction of his world, took the non-logical path for once, telling Kirk that, while it was logical to offer help, this time he didn't want to do it.
Back on Earth, Spock finally met with his older counterpart, who explained to him that he had wanted to make sure that Spock and Kirk became friends and shared the kind of friendship he and the other Kirk from his timeline shared: something which would ultimately define them both and was a crucial aspect of their lives. Spock had planned to resign from Starfleet and help rebuild Vulcan society, but the elder counterpart urged him to remain with Starfleet, put aside logic once in a while and do what felt right. About to join the surviving Vulcans himself, the prime Spock chose not to offer his alternate self the traditional Vulcan salute, noting that it would have seemed self-serving; instead, he wished him good luck. With Kirk now in command of the Enterprise, Spock offered his services as First Officer, which Kirk gladly accepted. ()