Alien World Order is the fifth and final episode in Duke Nukem 3D: 20th Anniversary World Tour. It is not available in the original version of Duke Nukem 3D or the Atomic Edition release of the game. Each mission is set in a different country around the world. From Amsterdam, Egypt, England, and all the way back to Hollywood itself to name a few levels.

This episode is also notable for featuring more than one boss enemy. All original bosses make an appearance throughout the levels, and for the first time - killing them will not end the level.

High Times Edit

The first level of Duke's world tour!

Set in Amsterdam of all places, Duke is back in action (although he's "too old for this shit!").

Red Ruckus Edit

Set in Moscow, Russia.

Bloody Hell Edit

Set in London, England.

Mirage Barrage Edit

Set in Egypt, amongst the Great Pyramids! This level contains the secret exit.

Tour de Nukem Edit

Set in Paris, France.

Golden Carnage Edit

Set in San Francisco, California. The Golden Gate Bridge plays a big part.

Hollywood Inferno Edit

The final level. Coming full circle back to where it began 20 years ago, Duke is back in L.A!

Prima Arena (secret level) Edit

The only secret level in Alien World Order, which is accessible from the secret exit in Mirage Barrage. Set in Rome, Italy. This secret level is perfect for Duke Match. Based on the Colosseum in Rome.