Martian Threat (Europe) (Proto) (Alt) ROM Download can be obtained free for Magnavox Odyssey 2 on EmuGames.net only. Play emulator game in English for the USA region. Martian Threat is a Magnavox Odyssey 2 ROM that you can download to your computer or play online within your browser. You can also download roms such as Butt-Ugly Martians B.K.M. Battles and Martian Gothic that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.