Josh peck as Casey Jones/Rouge Casey

Dave franco as Jason Langstram

Rob Paulson as Donnie12 /  Dark Donnie

Greg Cipes as Mikey12/ dark Mikey

Jason Biggs as Leo12

Seth green as Dark Leo

Sean Astin as Raph12/ Dark Raph

Gwendoline Yeo as Shinigami (also voices her as her vigilant counter part)

Kelly Hu as Karai

Kate Micucci as Irma (vigilante dimension)

Hoon Lee as Splinter

Kevin Michael Richardson as The Shredder

Note-that is the cast who are important  to the story