A mission gone awry transports Sonic the Hedgehog, his friends, Dr. Eggman and the Chaos Emeralds to another dimension: Earth.

It has been thirteen years since the Androids began their killing rampage and Son Gohan is the only person fighting back. He takes Bulma's son Trunks as a student and even gives his own life to save Trunks's. Now Trunks must figure out a way to change this apocalyptic future

Cooler has resurrected himself as a robot and is enslaving the people of New Namek. Goku and the gang must help.