The Rock Raiders were travelling on their spaceship, the LMS Explorer, mapping the whole Galaxy. They had just finished their journey and were headed home, when they drifted into an asteroid field. The ship was badly damaged and, to make matters worse, a wormhole caught the ship in its gravitational pull. The fuel supply was drained in the failed attempt to escape, and the LMS Explorer was flung into a distant Galaxy. They found themselves around Planet U, a planet rich in mysterious Power Crystals. They sent down Rock Raiders to mine it, and found vast amounts of Energy Crystals to power and repair the LMS Explorer, but they also encountered many alien creatures. The team would endure numerous hardships to obtain the Crystals, but they eventually triumphed, and successfully gathered enough Crystals to return home.