Wikipedia
Xexyz
Xexyz (pronounced zeks'-zees/zeks'-iz), known in Japan as , is a video game published by Hudson Soft for the Nintendo Entertainment System. The game was released in Japan on August 26, 1988, and saw a North American release sometime in April, 1990. The game was never released in Europe.
The story takes place in post-apocalyptic year 2777 after the Earth was devastated by nuclear war and natural disasters, the island nation of Xexyz is now threatened by Alien robots.