It didn't receive rave reviews, but Disney's monster-breeding role-playing game
Spectrobes was certainly enough of a hit with gamers to justify a sequel: SPECTROBES: BEYOND THE PORTALS. The story is set a few months after the first game, when it's discovered that the evil alien Krawl, thought to have been repelled by Planetary Patrol officers Rallen and Jeena, have returned and are stronger and smarter than before. They've also destroyed the lab, so all the Spectrobes (otherworldly creatures who are good at battling the Krawl) and fossils you collected in the first game have been destroyed.
There are 185 Spectrobes to collect, which is done by scanning the ground for fossils, digging them up, awakening them in the lab, and feeding them minerals (which are also dug up) to grow them into adults. Different planetary surfaces require different digging techniques and tools, such as using a flamethrower to melt ice, or a vacuum to suck up water. Before you can scan an area, you have to clear it of Krawl through live-action combat. First, players fight their way through the Krawl Dust using Rallen, then jump into the Vortex and unleash their Spectrobes to battle against the Krawl themselves.