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 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.
After hearing about the death of Master Splinter, the Rainbooms head to New York to help their Turtles Friends avenge their fallen master and end the Shredder for good.
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.