Private Lucas Walker is on top of the world. He's got a glowing laser sword, a power glove, and a warrior cat he rides into battle - items straight out of his favorite science fiction stories. But this is real life, and he's pretty satisfied with himself for having saved the solar system from invasion.But he can't rest on his laurels. Neptune's moon Triton is the next target of the spatial-temporal vortex, and is invaded by an army of what seem like vampires. And to make matters worse, Walker's newfound powers seem to be fading, and hope seems lost.Earth needs a hero again. Can Private Lucas Walker go two for two? Laser sword? Check. Power glove? Check. Warrior cat? Check. Give the alien vampires an ass-kicking? No problem.