Zach, the 'fifth Turtle' and his brother Walt visit the Turtles. As they leave, Walt takes a map that could guide Shredder to the lair... if it happens to fall into the wrong hands. Bebop and Rocksteady find out about the map by eavesdropping on Zach and Walt. Shredder, Bebop and Rocksteady pursue Zach and Walt through a Science Fair. Walt tries to look for a place to hide the map. Meanwhile, Zach gets captured by Shredder and gets taken to the Technodrome. Walt tries to find the Turtles to inform them of what has happened to his brother. April is broadcasting from the Science Fair and notifies the Turtles that Walt was seen being chased by Shredder through the Fair. The Turtles set out to find them and on the way they run into Walt who is fleeing from Shredder. Back at the Technodrome, Zach is driving Krang crazy. He is playing with all the buttons on the console. The Turtles find out where Zach is and rescue him, making Krang very happy.