Initially, A.D.A.M. appears as simply a green computer screen, with an EKG line like that on a medical monitor which spikes whenever he speaks. When in a body composed of nanites, he appears as an amorphous green blob vaguely shaped like Eggman's icon with red eyes, a black mouth, and the word "EGG?" written across his forehead. Later, after assuming Tommy Turtle's body as a host, he takes on the form of a silvery metallic turtle with white eyes. On his chest in this form rests a green orb, surrounded by a star-like frame with several cords of metal attached. Armor in the form of a helmet also appeared around his head and matching four blade-like appendages reaching from his back.