The film also features Jacob Kogan in several scenes depicting Spock's childhood, including his abuse at the hands of other Vulcan children due to his half-Human heritage, and his relationship with his parents (Ben Cross and Winona Ryder). The film also depicts Kirk and Spock's initial clashes at Starfleet Academy, and the gradual development of their friendship based on shared mutual respect, what the elder Spock calls "... a friendship that will define them both in ways they cannot yet realize." A major change in characterization from the primary timeline is alternate Spock's involvement with alternate Uhura (Zoe Saldana), his former student. At the end of the film, the young Spock opts to remain in Starfleet while his older self stays in the altered universe to aid the few surviving Vulcan refugees, as Nero had destroyed Vulcan, Spock's home planet.