In Heroes United, Upgrade looked the same as he did in Ultimate Alien except his green circuitry stripes glowed yellow. In Ultimate Alien, Upgrade's front torso was recolored green with black circuitry patterns and the Ultimatrix symbol on his chest was recolored green.
In Destroy All Aliens, Upgrade looked the same as he did in the Original Series except he had more of a metallic texture, giving the appearance of a computer's screen with circuitry patterns within. In Back with a Vengeance, Upgrade wore a yellow raincoat.
In the Original Series, Upgrade's front torso was white and the original Omnitrix symbol was on his chest. His body is made up of billions of small cell-like creatures called nanites. The green circle on his head is his eye, which glows whenever he talks. Upgrade has a black exterior with green stripes that resemble circuitry all over him.
