It was such a totally epic arcade game in the late 80's, Bally Midway's "Xenophobe." On a big nostalgia trip, I've been playing the arcade version of Xenophobe on a free MAME emulator on my laptop (and here's the game ROM you will need). The gameplay is something of a comical version of the film "Aliens" - your mission is to clear Moon bases and starships of aliens, before the self-destruct time ends.
And how much do I love this game?
Click on the epic Xenophobe wallpaper I made [above] to download the full size. And click on the image [below] to get the full sized map of the first 5 levels of the game.