Rose and the other Doctor started their lives together, soon after they were left in Bad Wolf Bay by the real Doctor.. Now known as John and Rose Tyler, they eventually fell in love, got married and had a son.. John Jr. looked a lot like his father.. actually, spitting image.. His father planted the Tardis coral immediately after settling in.. He followed Donna's instructions.. and then a Tardis started to grow.. They kept the secret from their son till he was older.. Now, several years later, John Jr. is grown.. his parents growing old.. Soon the Tardis contacts John Jr.. Something terrible has happened.. and he must step in, and become The Doctor.. His destiny is waiting inside the blue box.