Tmnt Ongoing TP Vol 15 Leatherhead

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.