Steve was minding his own business gathering logs for his journey, but suddenly a black extraterrestrial parasite entered Steve's body, in what caused deformation and changes in Steve's body and appearance. As the days progress, Steve's limbs would become unnaturally long. and the parasite has spread through Steve's nervous and neural systems, maintaining him alive even with such changes. Steve remains painfully conscious and aware of every thing, meaning he sees and understands every thing the Parasite is doing while controlling his body. His face has exaggerated features, such as an unnatural grin and bigger eye sockets. The Parasite is hostile, and made Steve kill his own pets and friends. As said in one of his voice-lines, Steve is in pain but is not able to do anything about it. As soon as the Parasite spots a player, the Parasite sees it as a prey and will start to stalk the player and mimic the voices of others to lure them into thinking they are safe.