The Rat King's dangerous game is coming to its end, but what will the outcome be--and how will it affect the Turtles once it's all over and they grapple with holding everything together as the rest of New York City struggles to find equilibrium?

As New York moves forward after the events of the Armageddon Game, the city's new dynamic means a new slate of challenges and opportunities. And while a dark threat lurks in the shadows of Mutant Town, several of the Turtles' closest allies separate themselves from the brothers. Plus, the Turtles take to the streets for a simple patrol...but what they find will rock their shells! Realities collide when they come face to face with a threatening force from the future. Can the brothers band together to take down this mysterious foe?

Then, Oroku Karai takes center stage in a battle for control of the Foot Clan. Karai has spent her life in the shadow of men: first her father, then her grandfather, Oroku Saki, the so-called Shredder. But no more. Now the Foot Clan is hers to command, and she has grand designs on seeing her clan reach its full potential. Karai has learned that Saki shared mystical secrets with the Teenage Mutant Ninja Turtles--secrets meant only for those loyal to the Foot. As she and those loyal to her set out to master the ancient way of the ninja, she'll discover that she's not the only one who lays claim to the Foot Clan's destiny.

Volume 18 includes The Armageddon Game issues #7-8, The Alliance #6, the 2023 Annual, Teenage Mutant Ninja Turtles issues #138-150, and the Untold Destiny of the Foot Clan miniseries.