While repairing space bridges, Young Optimus and his crew find the AllSpark, source of life on Cybertron, which attracts the forgotten Decepticons. They crash land on Earth and inadvertently cause a technological revolution.
Autobots take on the giant nano-roach and Bumblebee befriends an adventurous little girl, the daughter of the man who found the remains of Megatron and started the technological revolution. AllSpark interacts with her.