The Ultra Supreme Executive Chairman Drek-Mech (Limited Edition) was a vehicle in Ratchet & Clank. It was a mech suit piloted by Chairman Drek to fight Ratchet and Clank on the Deplanetizer on Veldin as the final boss of the game. Ratchet and Clank fought him in the mech, first with Clank as Giant Clank, and then with Ratchet's weapons, fighting over a set of plateaus and eventually the Deplanetizer.
In the 2016 re-imagined game, Dr. Nefarious pilots a near-identical Gadgetron Insta-Mech, which is the final boss of that game. The Insta-Mech is similar, though it notably uses a green cockpit, resembling Nefarious' green head in his robot form.
Drek piloted the mech in the Kyzil Plateau on Veldin, where he was attempting to use the Deplanetizer to destroy the planet so that its orbital position could be used for his new planet. Eventually, Ratchet and Clank encountered him in the mech as Giant Clank near the end of "Save Ratchet's planet", having fought through many blarg forces.
Giant Clank dealt damage to the mech, impressing Drek a little as he lamented that the defect could have been useful to him after all. However, Drek fired a beam with the mech that reverted Clank to his normal size, forcing the two to fight the mech with Ratchet's standard weaponry over a series of plateaus. Drek destroyed the plateaus with a burst cannon after they dealt damage to him, moving to the next, though Ratchet and Clank were able to follow him. Eventually, they caught him at the Deplanetizer itself.
Here, Drek told them that despite what he had told the blarg, he was not concerned with providing a new home for his people, but for profiting off each square inch of the new world, and intended to pollute the next world and destroy more planets to create yet another world in the interest of profit. Furious, the two dealt more damage to the mech and eventually caused it to crash inside the Deplanetizer and flip its laser. In a panic, Drek flew the mech off to his new planet, which Ratchet and Clank destroyed using the Deplanetizer's laser, destroying Drek and the mech with it.
The mech suit was a large, black mech with a vaguely humanoid form. It had two large arms, with the right arm containing a blue electro burst cannon capable of destroying entire rock plateaus, and the left arm firing mines. In place of legs, it had a thruster used for hovering. At the top was a translucent cockpit where Drek piloted it. Several missiles are fired from its cannons below. The bottom of the mech also launched Dark Gadge-Bots, shockwave bombs, and mines.
Behind the scenes
The mech appeared as a large enemy in the PlayStation Home firing range space.