Duke is sent back to the Old West, where aliens have taken over parts of the American West in an effort to detonate a bomb in Earth's core to destroy the planet. The humans have developed their own time machine in order to send a soldier back to re-write history, and destroy the aliens.

There, they tell him that the aliens are indeed screwing with history, so much that this future is just one if Duke wants the old one back he'll have to fight for it. Duke eventually meets up with the small band of resistance fighters in the old headquarters of the U.S. In this time zone, Duke battles through horrors of new alien breeds in the future, and the zombified corpses of those who didn't survive the fallout. However, Duke in his fight is teleported to the future, where the aliens have won and the humans are near extinction. Here, Duke discovers the aliens' true plan, to go back in time and mess with historic events so Earth now wouldn't be what it is and make it so they could easily take over. Duke pummels the alien menace through the streets of New York with the help of some Marines, and eventually gains access to the Statue of Liberty. Plotĭuke is called into action via the Government, aliens have once again landed and are wreaking havoc. Compared to the comically over-the-top thematic tone used throughout most of the series, this game noticeably features much more mature plot elements, such as an encounter with Jack the Ripper near the still-fresh murder scene of Mary Jane Kelly in Victorian England and a rather serious depiction of a future New York devastated by atomic warfare. Locations, weapons, items, and clothing are relevant to the time period Duke is in.

The plot revolves around time travelling aliens attempting to alter the course of history and eliminate Duke's ancestors. It has a 4 player split-screen multiplayer mode that uses a first-person view.

The game uses a relatively large 32 megabyte cartridge and can also use the Expansion Pak to allow for better graphics but slowing down the frame rate. Duke Nukem: Zero Hour is a third-person shooter video game in the Duke Nukem series, developed by Eurocom for the Nintendo 64.

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