 A robot named Jack Hammer tells Rodney that there are many scrap parts in the sewers of Robot City and that Rodney can go collect the scrap in order to keep the Rusties alive.After doing so, Rodney and the Rusties go to Bigweld's Mansion to find Bigweld.Bigweld agrees to help Rodney and the Rusties, and sets off with Rodney to stop Ratchet and save all robot-kind.