A Little Golden Book featuring Nickelodeon’s Teenage Mutant Ninja Turtles . Meet Leonardo, the leader of the Teenage Mutant Ninja Turtles. Confident and bold, he’s always ready to battle bad guys—if only he could wrangle his rambunctious brothers! Fans of Teenage Mutant Ninja Turtles ages 2 to 5 will enjoy this Little Golden Book that’s also sure to excite collectors. Leonardo, Michelangelo, Raphael, and Donatello burst from the sewers again in Nickelodeon’s animated series Tales of the Teenage Mutant Ninja Turtles .