An eager 12-year-old boy and his friend "Tree House Time Machine" race to secretly travel back in time in the hopes of unraveling the mystery surrounding his mother's untimely death before the rightful owner of the machine realize it's gone missing.
After supervillain Shredder escapes custody, he joins forces with mad scientist Baxter Stockman and two dimwitted henchmen, Bebop and Rocksteady, to unleash a diabolical plan to take over the world. As the Turtles prepare to take on Shredder and his new crew, they find themselves facing an even greater evil with similar intentions: the notorious Krang.