The way the Ratchet & Clank wiki capitalizes words has changed; therefore, this article should be checked, and, if necessary, capitalization should be fixed.
Ultra-Mechs were huge robots created from normal size robots by Ultra-Mech Pads.
The first known uses of the Ultra-Mechs were those developed in the year 5354, starting with the Ultra-Mech Unlimiteds created by the Blarg, in Ratchet & Clank, Clank transformed himself to Giant Ultra-Mech Clank in order to defeat the Ultra-Mech Unlimiteds and later the Drek's vehicle model Ultra-Mech.
Giant Clank also appeared in the PSP games: In Size Matters, Giant Clank flies through space and destroys the Technomite Ships, a Dream Giant Clank also appeared as a boss, and at the end of the game Giant Clank also fought Otto Destruct. In Secret Agent Clank, Giant Clank flies through the Quasar Fields in order to find Klunk.