Psycho Mantis, also known as Tretij Rebenok, is a fictional boss character in Konami's Metal Gear video game series. Psycho Mantis first appears in Metal Gear Solid, where he helps main antagonist Liquid Snake in his attempt to capture Shadow Moses Island. In a battle with the game's protagonist, Solid Snake, Psycho Mantis uses his psychic powers to talk directly to the player of the game in a way that crosses the fourth wall of the game screen, playing tricks with the game's memory card and controller. Psycho Mantis goes on to reappear in several later games in the series. In English, he is voiced by Doug Stone, while in Japanese he is voiced by Kazuyuki Sogabe.