After the Great Exodus of Cybertron Team Prime lives on Earth in a abandoned missile silo in an alliance with the United States government as Earth's defense team against the Decepticons. Though the Decepticons vanished for three years, the death of Cliffjumper has signaled their return. On top of that three human kids have discovered their existence and are now under their protection. Along the way the autobots government liasion Agent Fowler also helps to keep there secret from the outside world. The Autobots succeeded in stopping Megatron's plan to bring an army of zombies from Cybertron with a vile power known as Dark Energon, leaving Starscream in command in his absence.