The Rainbooms and their Ninja Allies from New York are thrown into another dimension with their enemies the Kraang and must join forces with the Dark Knight to stop them and return home.
The Ninjas of New York and Ponies of Equestria band together to rescue the legendary heroes of Equestria and defeat the enemy they fought a Thousand Years ago.
The New York Ninjas are back in Equestria to teach young creatures the importance of being a ninja, while dealing with the return of old enemies and new ones.
The Rainbooms are back in New York to help their friends the Turtles take on old threats and new threats, but this time with the help of old rivals and an old friend.
The turtles and their human friends have been to New York, Space, and Camp, now they enter a whole new world populated by pony folk and many other types of creatures.