IDW Publishing, who published the original 2015 Batman/Teenage Mutant Ninja Turtles comic book limited series, is not listed as being involved.
The cast includes frequent DC player Troy Baker, who will be voicing both Batman and the Joker in the film; while he has voiced both roles for seperate projects, this would be his first time doing both in the same project.
Baker will be joined by Darren Criss (Raphael), Kyle Mooney (Michelangelo), Baron Vaughn (Donatello), Eric Bauza (Leonardo), Rachel Bloom (Batgirl), Tom Kenny (The Penguin), John DiMaggio (Mr. Freeze), Tara Strong (Harley Quinn, Poison Ivy), Carlos Alazraqui (Bane), and Cas Anvar (Ra's al Ghul).
This wouldn't be the first cross-company crossover to be developed as a film - Dark Horse's 1989 Aliens vs. Predator limited series inspired several live action crossover films in the early 2000s.