Collects Teenage Mutant Ninja Turtles (2011) #56-60.
*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. *Source: idwpublishing.com