Following the events of Sonic the Hedgehog 3 (2024), Sonic and his friends continue their thrilling adventure to protect Earth from evil forces. This time, Dr. Robotnik (Jim Carrey) returns with a more dangerous plan than ever, after discovering an ancient technology that could allow him to control space and time.

With the help of Tails, Knuckles, and Amy Rose, Sonic must face a new mysterious enemy with power equal to his own. Meanwhile, Shadow the Hedgehog also emerges with his own agenda, putting Sonic in a difficult position where he must make tough decisions.