Later on in the game, Lo finds that Zilla's men have slain his old master, whom he had sought out to help him. Master Zilla realized that not having a warrior as powerful as Lo Wang would be dangerous, and sent his creatures to battle Lo Wang. In discovery of this, Lo Wang quit his job as a bodyguard. However, this led to corruption, and Master Zilla- the president - planned to conquer Japan using creatures from the 'dark side'. The premise of Shadow Warrior is that the protagonist, Chinese-Japanese, Lo Wang, worked as a bodyguard for Zilla Enterprises, a conglomerate that had power over every major industry in Japan. On May 19, 2017, Devolver Digital and General Arcade released a port of Shadow Warrior Classic Redux on Android devices via Google Play, featuring achievements, a redesigned HUD, touch-controls, and Bluetooth controller support. On July 8, 2013, Devolver Digital rereleased the game in the form of Shadow Warrior Classic Redux with the main game and both expansion pack featuring OpenGL graphics and visuals, remastered audio and modern PC compatibility. Later that day they announced that they decided to offer copies of the game on Steam for free forever. On May 29, 2013, Devolver Digital announced the game would be free to obtain for a limited time on Steam, after a promotion to offer redemption keys for it on Facebook was exploited. On April 1, 2005, 3D Realms released the source code for the Shadow Warrior engine under the GNU General Public License, which resulted in the first source port a day later on April 2, 2005. A combination of Duke Nukem 3D and Shadow Warrior was published by GT Interactive in March 1998, titled East Meets West.

Although ultra-violent, the game emphasized tongue-in-cheek humor and contained some sexual themes (although less blatantly than in Duke Nukem 3D).

The game's improvements included introduction of true room-over-room situations, the use of voxels instead of sprites for weapons and usable inventory items, transparent water, climbable ladders, and assorted vehicles to drive (some armed with weapons). Mark Adams ported Shadow Warrior to Mac OS in August 1997. Shadow Warrior was developed using Ken Silverman's Build engine and improved on 3D Realms' previous Build engine game, Duke Nukem 3D. First-person shooter Shadow Warrior, also know later as Shadow Warrior Classic or Shadow Warrior Original, is a first-person shooter video game developed by 3D Realms and released on by GT Interactive.

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