After the defeat of the shredder and the remainder of the footclan, peace has come once again. As time passes, the people of Earth establish a peace treaty with aliens and other beings from all over the galaxy, The turtles decide to split up and seek different interests in life after the passing of their sensei/father splinter, Leo journeys to South America and continues his training, Donatello resides in Europe after hearing about a peace treaty with aliens must be established, Raphael becomes a space ranger defending earth from possible invasions while Michaelangelo remains in New York and pursues to carry the mantle that splinter has left behind. The year 2090 comes around and the turtles age, but after hearing about a new threat that comes to New York, Michaelangelo trains 4 students to become Earth's next defenders.
