Casey Jones has run into a major problem—his arch-enemy, Hun, leader of the Purple Dragons, has allied himself with the Shredder…and gained a new power in the process, upsetting the balance of the streets! Luckily, Casey has friends to turn to when the going gets tough: the Teenage Mutant Ninja Turtles! While our heroes are dealing with this newly evolved threat, three foul fowl with an agenda involving April O’Neil materialize in Manhattan. There’s just no rest for the good guys these days!