During Krang and Shredder's attempt to obtain a secret formula from Dimension Z that could turn crude oil into liquid hydrogen, Mister Ogg came through the Dimensional Portal to Earth where he wreaked havoc throughout the Technodrome (turning it into a giant pumpkin, shrinking Rocksteady and Bebop, and eating Shredder's entire collection of ancient porcelain art) before Krang convinced him to trade the formula in exchange for where to find more ancient porcelain, adding that those on the surface (but especially the Turtles) had persecuted and exiled them to the center of the earth. Emerging above ground to seek revenge for how his new "friends" had been mistreated, Ogg began to show havoc throughout the city and briefly fought with the turtles before they too discovered his fondness for e