Teenage Mutant Ninja Turtles: The Assassin and the staff

While the turtles are on patrol, they notice the foot are trying to steal an ancient staff, known as the staff of the Avatar, which has the ability to control all elements, the turtles decided to stop the foot, only to know that someone is ready to strike, only known as the Assassin, he manages to defeat the turtles, the Turtle's come back bummed and angry as they tell splinter what has happened for him to tell the turtles that the staff has been split into four different parts, scattered around the globe, the one shredder has is of the fire element and they must find the other three, for if all are restored, the user will wield such power that there will be no stop to the end of all kind.