The main story follows the two protagonists, Rallen and Jeena, when they are sent through a portal which leads them to another star system which is being invaded by a massive army of Krawl. They must use the Cosmolink, an ancient device for summoning Spectrobes, to defeat the Krawl leader, Krux, to finally bring peace to the star system once and for all.
Spectrobes: Origins gameplay features the unique Wii controls to explore vast worlds, excavate three-dimensional fossils and unravel an engaging story while discovering the key to preventing a galactic threat. While immersed in the universe as never before, players fight enemies by controlling planetary patrol officers, Rallen and Jeena, with a Spectrobe creature at their side in large-scale, real-time battles. The game has free roam and multiple planets to explore.
Source: Wikipedia, "Spectrobes: Origins," available under the CC-BY-SA License.