Emek and Luna reached a wide canyon where a bridge was marked with a giant number line. Several numbered markers had fallen out of place, leaving gaps that made the bridge unsafe. Dr. Dino explained that the markers had to be returned in the correct order before anyone could cross. Emek and Luna carefully compared the nearby numbers and placed each missing marker where it belonged. When the number line was complete from start to finish, the bridge became safe again, and the three friends crossed the canyon together.