Teenage Mutant Ninja Turtles #15

As the Turtles continue to get used to a world leading the Foot Clan post-Shredder, they return to the Technodrome to monitor the revival of the Utroms on Burnow Island. They are surprised to meet a new mutant–Leatherhead! Will the mysterious mutant be friend or foe? Collects issues #56–60.

Characters: Aka (TMNT), Alopex, Angel (TMNT), April O'Neil, Ch'rell, Churk, Donatello, Fugitoid, Harold Lillja, Jennika, Kitsune, Krang (TMNT), Leatherhead, Leonardo, Master Splinter, Metal Head (TMNT), Michelangelo, Mouser, Raphael, Sergeant Granitor, Shredder (TMNT), The Rat King, Traag