The climactic showdown between the Mutanimals and Null! Surprises await both sides of the conflict!

April is on the run after discovering a scheme with dire consequences for Mutant Town. Meanwhile, the Mutanimals take drastic steps that will put them on a collision course with the TMNT!

Baxter Stockman is looking to become the new major villain on the streets! His first step to world domination? Turn the Mutanimals into robots!!

It's up to Slash to rescue the rest of the Mutanimals. Will he be able to put the Turtles' training to good use and save the day? Part two of a special story that documents the Mutanimals first adventure together!

Old Hob, Slash, and their crew have become a force to be reckoned with, but a kidnapping leads them on an adventure more wild and dangerous than they could ever have imagined. Then, the Turtles return from Burnow Island to find unimaginable tragedy. Meanwhile, Casey prepares for a final showdown with Hun, and April has come into possession of an ancient scroll that seems to point to answers regarding the Pantheon. It all leads to a final showdown as Karai decrees a Gauntlet battle between Splinter and Shredder. Collects the Mutanimals mini-series, issues #45–50 of the ongoing series, the 2015 Free Comic Book Day issue, and the Casey & April mini-series.

All-ages action building on the hit Nickelodeon cartoon series! Follow all of the Turtles’ adventures in the stories “The Meeting of the Mutanimals,” “Zodiac,” “Zine-Age Mutant Ninja Turtle,” and “Donnie Finds a Relic!” from the Amazing Adventures series.

As the Turtles struggle to come together in the face of recent setbacks, Old Hob's unusual new enforcers make their presence known. Will they be friend or foe?

The Turtles are separated, each trying to find their own way forward. With their absence, Old Hob fills the power vacuum with the help of some very unusual new mutants!

Old Hob, Slash, Herman the Hermit Crab, Mondo Gecko, and Pigeon Pete have become a force to be reckoned with. When someone close to the group is kidnapped, the Mutanimals end up on an adventure more wild and dangerous than they could have imagined! What mysteries lurk at…The Null Group?

The Shredder returns and Mutant Town is in danger of being destabilized by forces outside and in! Oroku Saki has been to hell and back, but will he now come to the Turtles as friend or foe? Meanwhile, April makes a stand against Baxter Stockman—with dangerous consequences—and the Mutanimals take drastic steps that will put them on a collision course with the TMNT! Then, as a protest at the Mutanimals HQ turns violent, TMNT allies and enemies rush to take advantage of the situation, but not before Old Hob makes a surprise decision that will shake allegiances! Collects issues #118–123 of IDW's Teenage Mutant Ninja Turtles.