Shadow Warrior is a first-person shooter video game developed by 3D Realms and published by GT Interactive Software. Lo Wang is a bodyguard for Zilla Enterprises, which has control over every major industry in Japan. However, this has led to corruption. Master Zilla, the president of the Zilla Enterprise, is planning to conquer Japan using creatures from the "dark side". When he discovers this, Lo Wang quits his job as a bodyguard. Master Zilla realizes the threat that Lo Wang poses and sends his creatures to battle him.

Later on in the game, Lo finds that Zilla's minions have killed his old mentor, Master Leep. Following his master's dying words, Lo must avenge his death. The game ends with Lo Wang defeating Master Zilla, who commands a samurai-like war-mech. However, Zilla is able to escape Lo Wang, promising a future encounter.