Part 1 of 3. Following a civil war on planet Cyberton, the heroic Autobots and the evil Decepticons are marooned and deactivated on planet Earth for 4 million years!
Part 2 of 3. Using their robotic powers to hide in plain sight, the Autobots and Decepticons disguise themselves as Earth vehicles, and their war between good vs. evil continues.
Part 3 of 3. The Decepticons' ship to planet Cybertron is complete, and the odds are stacked against Optimus Prime, Bumblebee, Jazz and the others in the battle to stop them.
After his accidental transportation to Cybertron, Megatron returns- and he wants to get his hands on an anti-matter formula created on Earth that could mean limitless power for the Decepticons!
While protecting an Earth military plant from a Decepticon attack, Optimus Prime is severely wounded. His only hope for survival is a new Cosmotron unit.