Tad and Lily need a little number sense to help them get through a complicated game. So their magical firefly friend, Edison, takes them on a fantastical journey under the sea! When a pirate mistakenly captures their cute puppy pal Scout, they must use their new understanding of counting, grouping and estimating to rescue him. Join them as they navigate the deep and face foes such as sharks, crab henchmen—even Pirate Pythagoras himself—and begin to see numbers in a whole new way!