In the twenty-second century, young Johnny and his friends are preparing for a dog or pet show, but for an Extraterrestial Animal Show. With the weird ""rock"" as his entree, Johnny walks away with the Best In Space ribbon to the amazement of all the other contestants. Subsequently, Johnny, Cherry and Uncle Rob set off on an X-Tee expedition. Strange things happen after a spaceship-wreck lands the three on an odd planet, but in the end, the incomprehensible becomes comprehensible. The author has done a fair job of injecting humor into science fiction, but the reader's interest ebbs at points in the rather long story.