Fallout is a series of role-playing games in a post-apocalyptic setting. Originally Fallout was developed by Black Isle Studios. After Obsidian Entertainment took over the development the series eventually evolved into action-role playing games. The fallout series is extremely popular and consists of several installments, a tactical role-playing game, an MMORPG set in the Fallout universe, several mobile games, and others. The Fallout series generally revolves around a post-apocalypse brought on by nuclear catastrophe. Humanity manages to survive using a system of sophisticated vaults.