The game is set in Central America in 1974, as player takes control of the famed “Snake” (Big Boss): the legendary hero who had once saved the world from the brink of nuclear war. Snake has now turned his back on his mother country and established ‘An Army without a Government’ in South America, and is approached by visitors from ‘A Nation without a Military’ to investigate suspicious activity in the peaceful paradise of Costa Rica. Amidst the turmoil of the cold war, Costa Rica alone had managed to be a beacon of peace in a region torn by conflict, but all of that may change.