Benvicktor has an appearance similar to Frankenstein's monster. He has a muscular body and he has a human nose. He has greenish grey skin. He has a black mullet hairstyle with sideburns. He has two tower like conductor coils on his back.
Benvicktor wears black pants with lines on them with a triangle dash in the middle that glow green. He has stitch like lines on his arms (right arm: half of his shoulder and left arm: half way from his glove). He has brown gloves with his fingers showing. He has 3 black bolts on his chest and 1 black bolt on each side of his neck, all bolts have a green line on them. He has white lines on his waist that connects it to the Omnitrix. He wore the Omnitrix symbol on his waist.
In Ultimate Alien, Benvicktor's skin is completely grey. His gloves are now grey and so are his tower like wire coils. His belt is now grey and a grey hexagon is where his Omnitrix symbol used to be. The bolts are now grey and now have no green line on them. The Ultimatrix symbol is now on his chest.