Finding a rare zucchini-colored crayon leads twelve-year-old River Monroe and his friends on an adventure with their eccentric neighbor to save Earth from invading interstellar storm troopers. Interest Level: 3-6 Reading Level: 5.1 ATOS Book Level: 5.1 AR Interest Level: MG AR Points: 10 AR Quiz: 159631EN Reading Counts Level: 4.5 Reading Counts Points: 17 Lexile Measure: 730 Fountas & Pinnell: W.