The sequel to Rare and Midway's groundbreaking fighting game with 3D-rendered characters, Killer Instinct 2 refined and expanded upon the gameplay system of the original game in numerous ways. KI 2 adds a Super bar which enables more powerful attacks, an expanded combo system based around "autodoubles," throws and parries, easier combo breakers and a remixed roster of characters. The backstory has the returning cast sent back in time and fighting to defeat the evil Demon Lord Gargos, with varying endings depending on which characters they defeat with finishing moves.