After Sam Witwicky learns about the ancient origins of the Transformers, he once again joins the Autobots to stop the Decepticons from destroying the Earth.

On the planet Cybertron, a war was waged between the Autobots and the Decepticons for control of the Allspark, a mystical talisman that would grant unlimited power to whoever possessed it. The Allspark is smuggled off the planet, but Megatron goes in search of it. He tracks it to Earth and his desire for power sends him into the Arctic Ocean. The sheer cold forces him into a paralyzed state. His body is later recovered, and before going into a comatose...

Charlie Watson discovers and repairs an old Volkswagen Beetle as a way to remember her father and stake her independence from a stepfather she abhors, with only the music of The Smiths and the unrequited crush of the boy-next-door for friends. When she discovers the VW Bug is actually an alien robot on a reconnaissance mission for the rest of his race, the two form a bond which eventually has her putting her life on the line against evil alien robots,...

Boulder is a Rescue Bot that turns into a bulldozer. After saving a cat from a tree, Boulder wants a pet of his own and decides to adopt the lion from the zoo!