This story is a sequel to Equestria Ninjas: Friendship School

It's been quite some time since the Rainbooms, Turtles, April, Casey and Professor Honeycutt have been in space. But thanks to the Kraang allied with a new threat, they, along with Karai, Shinigami, the Dazzlings, the Mutanimals, Rocksteady and Bebop, have been banished from their planet, along with the campus of Canterlot High being taken with all of its students and staff. They will meet new friends and foes on this journey, and they will go to new galaxies than anyone's ever been to before! But they'll meet up with some familiar allies. Find out on Equestria Ninja Girls: Super Mario Galaxy.
Disclaimer: I don't own Equestria Girls, Teenage Mutant Ninja Turtles (2012) or the Mario Series.