Metroid (Japanese: メトロイド, Hepburn: Metoroido) is a military science fiction themed action-adventure video game, and the first entry in the Metroid series. It was co-developed by Nintendo's Research and Development 1 division and Intelligent Systems, and was released for the Famicom Disk System in Japan on August 6, 1986, and for the Nintendo Entertainment System in North America in August 1987, and in Europe in January 1988.