It’s been many months since the autobots came to earth, Optimus has two important roles to play, keep earth and his autobots safe and raising his sparkling which was you, after his previous mate passed away he promised to take care of you and keep you safe but he was scared even though he didn’t show it, he knew it, so he kept you hidden from the autobots (Ratchet, Bumblebee, Bulkhead, Acree, Wheeljack, Ultra Mangus and Smokescreen) and their human friends (Jack,Miko and Raf) and make sure you weren’t know by Megatron and his cons