Zero believes that he is a hero, but the counting numbers think he is worthless until they get into trouble with some Roman numerals, and only Zero can help. Interest Level: K-3 Reading Level: 2.6 ATOS Book Level: 2.7 AR Interest Level: LG AR Points: .5 AR Quiz: 149831EN Reading Counts Level: 1.5 Reading Counts Points: 2 Lexile Measure: 450.