"I'm from a different version of the timeline," he put it, bluntly. "Our timelines run the same up until Stardate 2233.04, when Nero, a Romulan miner from 2387 in your timeline, arrives in the past and attacks the USS Kelvin and subsequently killed my father, who took the helm when everyone abandoned ship. Nero was caught in the wake of the Romulan star going supernova, which created the rip in fabric of time and opened opened a door to the past for him."