Zero

Raph and his brothers where on a mission. The Kraang where shipping some dangerous superweapon into New York, but when they intercepted the convoy, they found a pale, nearly lifeless girl in a straight jacket and chains. After freeing her from the Kraang, they learned the true extent of her abilities, and knew they had to keep her out of the Kraang's reach.

P.S. This takes place about a month after my Axolotls story, so Aja and Sirus will return!