Planet Kepler was once lush and beautiful. However, after Earthlings exploited the Callaro plant to extinction, it is dry and dying. In an outer space 3-D animated adventure, three brave Kepler SpaceKids—Axel, Jono, and Gaga—journey down a volcano to retrieve the last Callaro seed. Along the way, they battle evil Earthlings, giant spaceships, and destructive robots, aiming to save their planet by following the ancient legend of the lost Callaro oasis.