The Flatwoods Monster was a massive, heavily built 3-metre-tall alien (10 feet) with a build similar to a sumo wrestler, with a large belly and bulky, muscular arms and legs which it uses in combat. Its body is grey in color and has numerous lines that run down its sides. Its face that has circular eyes with prominent pupils, a rectangular mouth and an angular nose. Its overall head is not unlike that of a nutcracker. Its head was also adorned by a stocky helmet.