New York City's Heroes in a Half Shell and Gotham's Caped Crusader join forces against their greatest enemies—Krang, the Shredder, The Joker, and more— in a trio of tales that mash up the dimensions of the Turtles and Batman... putting all of reality in jeopardy! This massive omnibus collects BATMAN/TEENAGE MUTANT NINJA TURTLES #1-6, BATMAN/TEENAGE MUTANT NINJA TURTLES II #1-6, and BATMAN/TEENAGE MUTANT NINJA TURTLES III #1-6, plus hundreds of pages of behind-the-scenes material from artist Freddie E. Williams II and a brand-new introduction by Teenage Mutant Ninja Turtles co-creator Kevin Eastman!