Transformers: Rumble

There was a confrontation between the Autobot Military alliance (N.E.S.T.) and the Decepticons in 1984, after the confrontation, the Autobots became famous and became the heroes of Earth, while Bumblebee disappeared after the fight and was never seen again. The year is now 2023, the Autobots and Humans have already adapted to life together, while the Decepticons are recovering with evil plans for domination of the universe, hidden, just waiting for the right moment to reveal themselves. Bumblebee, despite being missing, has become a heroic legend for humans, only the other Autobots know of his location.