Red Planet

"When Jim rescues a strange alien from certain death, he names the creature Willis, and the two become inseparable. It turns out that Willis is a Martian bouncer, a ball of fur with extraordinary powers of mimicry. When Jim brings Willis to his school on Mars, the headmaster confiscates his furry friend for scientific study, prompting Jim and his buddy Frank to launch a rescue operation, only to stumble onto a treacherous plot. Embarking on a desperate quest to warn the colonists, the three friends set in motion events that will change the red planet forever."--BOOK JACKET.