After draining the Turtles' life energy & Krang's intelligence, Dregg plans to fire the Vortex Transporter at the Sun, bringing a piece of the Sun down to Earth. If the people of Earth refuse to surrender, Dregg will cause the Earth to become a second Sun. Meanwhile after learning of the situation, Carter returns, and knowing he can't handle it alone, Carter contacts the turtles' friends Landor and Merrick who brings the turtles' past selves to the present as well as Splinter mentioning to him that despite his mutation being stabilized, there is a chance that Carter can still mutate.