Alien Invaders - Plus (USA, Europe) ROM for Magnavox Odyssey 2 (). Alien Invaders - Plus (USA, Europe) game is available to play online and only onRoms Games. Alien Invaders - Plus (USA, Europe) ROM for Magnavox Odyssey 2 requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.