Twins, Castor and Pollux Stone are smarter than just about anybody. Just ask them. When they finagle a trip to Mars with then rest of the family, they run afoul of the Tourism Board and need rescuing by Grandma Stone, the only person who MIGHT match them in intelligence. But it will take the combined brain power of this family of geniuses to save them from a furry little nuisance who will eat them out of house and rocket ship as they roll along on their epic space adventure.