James T. Kirk/Starfleet career/Return/Stealing the Enterprise

Kirk's return to Earth in 2285 was solemn. The loss of Spock affected Kirk deeply, and McCoy began to show signs of mental illness. Planning to return to the Genesis Planet after his battle-damaged starship was fully repaired, Kirk's hopes were dashed when Commander, Starfleet Fleet Admiral Morrow announced that the Enterprise would soon be decommissioned. 
Ambassador Sarek approached Kirk, leading to the discovery of Spock's katra surviving in McCoy. Kirk's senior officers rallied to him, conspiring to rescue McCoy and steal the Enterprise from Spacedock One in order to recover Spock's body from the Genesis Planet and to bring it, and his katra, to Mount Seleya on Vulcan. 
At the Genesis planet, a Klingon Bird-of-Prey's attack left the Enterprise disabled. After setting an auto-destruct sequence, Kirk and his crew abandoned the ship for the surface. The Enterprise was destroyed, taking a Klingon boarding party along with it. Finding Spock's body reanimated by Genesis, Kirk took the Bird-of-Prey to Mount Seleya on Vulcan, where Spock's katra and body were reunited. ()