Nothing interesting ever happens to Bob . . . until he meets Space Rock, a loudmouthed rock who's just landed from the planet Kal-dor. That's just the start of this hilarious science fiction romp. "The unusual purple rock that Bob has found begins to talk, telling him that it fell out of a space ship and needs Bob's help to return to the planet Kal-dor. The subject matter will help lure problem readers and the simple vocabulary will keep them going. Vivid watercolors will add to children's enjoyment." — Booklist.