Alien Syndrome (1987) for DOS is an arcade-style action shooter ported from Sega’s popular arcade game. Players battle through spaceship and space station levels, rescuing hostages while fighting off waves of grotesque alien creatures. Featuring timed missions, top-down gameplay, and two-player co-op, Alien Syndrome delivers fast-paced, challenging action. Its sci-fi horror atmosphere and boss battles made it a standout among early run-and-gun games on home computer systems.