Krypto the Super-Dog and Superman are inseparable best friends, sharing the same superpowers and fighting crime side by side in Metropolis. However, Krypto must master his powers for a rescue mission when Superman is kidnapped.

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...

The Autobots return from exile to battle man-made Transformers along with a former enemy from their home planet.