Altered Beast is a 1988 beat 'em up arcade game developed and manufactured by Sega. The game is set in Ancient Greece, and follows a centurion who is resurrected by Zeus to rescue his daughter Athena. In order to save his daughter, Zeus transforms the centurion into beasts with the use of power-ups. After its initial arcade release, it was ported to several home video game consoles and home computers, including the Mega Drive/Genesis, for which it was a pack-in game.