Cosmo, along with his family, and his trusty robot, Rex, live on Mars. He loves to build things and take things apart with his tools. Cosmo's life isn't easy, though. His sister, Jewel, is constantly picking on him and bossing him around, and his beloved robot started acting like a monster. Cosmo is devastated when his father takes broken Rex, his only friend, to the junkyard, and even his new Super Solar System Utility Belt doesn't make it better. Jewel and Cosmo are sent to collect rocks for an experiment. Even though they are supposed to stay together, Jewel leaves Cosmo behind when he starts taking apart an old machine to look for reusable parts. He goes to look for Jewel and realizes she is in big trouble - Rex is chasing her! Cosmo uses his trusty tools, the ones his sister thinks are stupid, and his imagination, another thing his sister makes fun of him for, to save Jewel from Rex. Cosmo also figures out a way to fix Rex. After the ordeal, Jewel finally gives Cosmo the respect he deserves.
Anyone who has ever had a bossy older sibling or a best friend who goes way can relate to this science-fiction picture book. Also, students can imagine that one day it might be possible to live on another planet and have a robot for a friend. Brian Pinkney's illustrations of scratchboard with dyes and acrylic paints completely fill up each page, giving the story a dated feel. At the end of the book, the author includes the features and descriptions of each attachment on Cosmo's Super Solar System Utility Belt. Students would have fun predicting what adventure Cosmo might have next on Mars or another planet, or coming up with their own trusty utility belt with all new attachments. Grades K-3