The Crazy Scientist has unprinted black legs, and a white torso. The torso is printed with several buttons, and a belt holding a beaker and a pair of pliers. The belt continues around his back, with two further test tubes and a clamp wrench. His arms are white, and his hands black. He has a yellow double-sided head. One side features grey and clear goggles, and a determined expression. The other has a crazed expression, and red and grey lenses in his goggles. He has large, rubbery grey hair.
The Crazy Scientist cut off Jack McHammer's arm, which was then replaced with a cybernetic arm. He also made the Monster, who is now Jack McHammer's monster arch-nemesis.
He is the only villain in the theme who is not a monster.
It is odd that he has gray hair but a black mustache.