The Central Computer is out of control and it is up to you, Space Marshall Alpharoid, to put an end to the evil Computer before it destroys humanity. Guide Alpharoid through 8 worlds infested with flying enemies until you reach the heavily protected Computer Base. Fly into one of the craters in the landscape to enter an underground tube and fight robots and aliens in hand-to-hand combat! If you win, you can capture power-ups and upgrade Alpharoid's arsenal. This is an unofficial conversion of the 1986 MSX game of the same name.