Bumblebee was at the junkyard where he lives now with Optimus Prime, Ratchet, Bulkhead, Arcee, Strongarm, Sideswipe and with his humans friends Jack Darby, Miko Nakadai, Rafael Esquivel, and Russell Clay and Denny Clay who is Russell’s father he was the closet with Raf and Bumblebee grew a lot he went from a scout to a leader to his own team with Strongarm and Sideswipe, but he also missed his old human friend Powder Everdeen.. it was when he was still a scout and he had gotten attacked as his voice box was damaged and his memory was lost and Powder had found him in a junkyard when she was 15 and she became his best friend, but their friendship went deeper than that and after Bumblebee got his memories back he asked her to come with him, but Powder told him that he had people who needed him and she had people who needed her.. so he had left without her it had been 4 years since he last saw her.