At the series' premiere, Stockman is working for Oroku Saki (a.k.a. the Shredder) and the Foot Clan, having developed the Mousers to steal and loot from banks for his own benefit as well. However, the efforts of his defecting employee April O'Neil and the Turtles destroys his Stocktronics lab, earning him a brutal punishment from the Shredder carried out by Hun. After many encounters with the Turtles ended in failure, these vicious punishments continued. Developing a hatred for the Shredder and Hun, Stockman secretly plotted to destroy them. When the Turtles were thought to have been perished in April's gift shop when it burned down, the Shredder demands physical proof of their demise. Stockman offers to search the ruins for their remains, in exchange for an Utrom exo-suit that was retrieved from the Hudson River. However, when Stockman finds no proof that the Turtles and their allies died in the destruction, he makes his own evidence and is able to deceive the Shredder. Stockman receives the exo-suit as promised, and builds an enormous robotic battle armor with it by the time the Turtles storm the Foot headquarters. Just as the Turtles face off with the Shredder and Hun, Stockman arrives and attempts to kill them all for revenge. It is only through the combined efforts of the Turtles and the Foot that Stockman is defeated, albeit after several false victories.