Machines and man make a great combination. But sometimes great combinations fail to live up to the expectations. Something similar happens to Bumblebee, an Autobot. It has been twenty long years since he sought refuge in a long forgotten junkyard. The yard serves as the abandoned home to the lonesome Bumblebee. His life or rather mechanical life goes for a toss when he is taken away by young and innocent Charlie to her home. Amidst all the speculation, she is taken by a pleasant surprise that the piece of junk she has brought home is anything but ordinary. She discovers Bumblebee and comes to know about his past. The two make a great team and this teamwork proves instrumental when they have to counter enemies from the government agency. A lot of adventures laden with emotions ensue. Finally, the deserving duo wins over the vicious elements.