Arnold saves the day by activating the generator that provides Mars with a breathable atmosphere. It's possible that it was all a dream. In the beginning of the film Arnold gets dreams implanted. While doing so, the technician looks at the tape of the implanted memory and says: "Blue sky on Mars. That's a new one." This is the exact ending of the movie.
Revealing mistake: Doug has the hologram when inside the alien nuclear reactor, and a bunch of bad guys encircle the holographic image and fire at it at point blank with automatic weapons, and not one bad guy gets hit. If they encircled the 3D image, at least a few bad guys would have been hit by their own men. (01:37:00)
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