The crew of the starship Swordfish are in an engagement with space pirates. Suddenly, the battle takes a turn for the worse and the crew activate their jump drive without a destination. They end up flung across the galaxy to the galactic core. The Swordfish however is badly damaged with many casualties. Even the captain was killed while "en route" to the mysterious destination. Only 26 of the crew survive, and only six of them are qualified for combat operations: the commander, two soldiers, a mechanic and a doctor. They are responsible for using the six giant "Module" mechanized suits available for them after the fight with the space pirates. They discover a human colony that is under attack by a relentless mechanical aliens dubbed "Berserkers".