You are Cadet Qaylan Furlong. Your father was killed by the Borg in the battle of Wolf 359. Now, ten years later, the Borg are attacking again, and Starfleet won’t allow you to stay aboard the Starship Cheyenne to avenge your father’s death.
But Q will. He’ll do better than that, in fact. He will take you back in time ten years and put you on the same ship as your father to give you a chance to save him… and the entire Federation.