You were a normal a kid as normal as a 12 year old ninja mutant can be but everything changed on one day when you were fighting shredder who had successfully managed to open a unstable portal to the krang world. You were fighting the best you could until Shredder knocked you off balance and you were sucked into a different world as your brothers tried to get you back but the portal closed it was too unstable.

7 years later for you

You are walking through an unknown world that you have traveled through trying to find the one portal that takes you home. Your device is buzzing so you know another portal is close.