Giant Clank was Clank transformed into an Ultra-Mech, first seen in the game Ratchet & Clank. While transformed, he was enlarged and fitted with a wide array of heavy machinery. He could shoot rockets from his arms, launch energy bombs, knock enemies out cold with one punch, and crush opponents under his huge weight. He was around 50 times taller while being giant (around 110 feet or 33.5 meters). However, he can only transform when standing on a certain large pad.
The technology that enabled Clank to enlarge was developed by a scientist on planet Quartu, and was originally intended for Drek's use. Clank used this special form several times, including the fight against the Ultra-Mech Unlimited robots, the beginning of the fight against Chairman Drek.
In Going Commando, Giant Clank fought against the Thugs-4-Less Leader on Dobbo Orbit so that he and Ratchet were able to enter the Megacorp Games on planet Joba. He also fought the Mothership on the moon over Damosel. In Up Your Arsenal, Giant Clank fought the Terror of Talos in a Secret Agent Clank episode.
Giant Clank appears in Full Frontal Assault. Comically, he has a lombax plushy on his back. Giant Clank has no extra abilities in this game but is used as Clank's armor, he can also use the Fists of Justice. He is also a lot smaller, just being slightly larger than Qwark; this is likely due to Al's De-Bigification Ray.
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In his giant form, Clank's doppelgänger, Klunk, was even stronger still, and more heavily armed but seemed to be smaller.
In Ratchet & Clank, when Clank transformed, he could only jump a few feet high, but in the next two games he could jump much higher; in Going Commando, this can be explained by the lower gravity present when Clank transformed.