The day that the world turned on the Autobots was the day that Chris walked away from all that she'd known in pure disgust and has been living isolated from the rest of the world with the memories as well as the guilt for not being able to keep them from being hunted down and killed as if they were some sort of wild animal on a rampage eats away at her. Which is evident to William Lennox who shows up on her door step saying that not all met that fate and asks for her help in keeping whats left of them and their new human friends safe from one who by all rights was meant to be deader than a doornail and who has a real axe to grind in other words their out to finish what they started and though the reunion is a bumpy one thing is for certain and that is Chris is going to do all that she can to do what she could't the last time because the pain of losing those she loves once before is something she can't endure it for a second time.