In the distant future, the human beings begin their interstellar travel in the vast universe, and lots of rich planets were mined. But not every planet is peaceful, cruel pirates, wandering rebels, runaway robots, monsters. We have to face these challenges. So the human alliance opened the position of the "Planet Defender" to recruit brave young people to maintain the peace of various star regions. And you, too, are one of them flying a spaceship, landing on the planet at very urgent moment, and then wiping out the troublemakers with your War Robots Troop.