The Espheni are tall, thin, bipedal grey aliens. They tower over humans and Skitters. They look like dolphins from the chest up, leading the most factions to call them "fish-heads." They have very skinny arms that go from their shoulders to their knees. Their eyes are mammalian in appearance and they do not appear to have noses, rather, two nostril-like holes around the corners of their eyes. While they prefer not to fight and direct their harness slaves to do the fighting, the Espheni are physically very strong. As demonstrated by the fact that an Overlord was seen effortlessly snapping the heavy metal chains meant to restrain him simply by standing up and swinging his arms. They carry concealable swords inside their arms and it is unknown what material it is made of.