The Neutrinos return to Earth after hearing of Krang and Shredder's plan to get rid of the turtles via brain-drain. Shredder finds interest in their Starmobile's ability to open dimensional portals and tries to get his hands on it. Meanwhile, the turtles try to get the Starmobile's main energy source running again.

While Splinter goes out on a retreat, the turtles must try to stop the Technodrome from returning to Earth.