Robotron: 2084 (Atari 5200)

It's the year 2084, and you're the only one left who can defend humanity against the Robotron armies! You've got to move quickly to rescue the defenseless humans. Blast fast with your anti-robot laser gun to shatter the oncoming waves of Spheroids, Electrodes, Quarks and mutant Progs. Only you can save the last surviving humans!