AU Sarah never really believed in those stories where something comes crashing into the window and/or waltzes through the door and instantly changes your life... at least until it happened to her.

No one knows who it will choose, or why. Few even know of its existence. But when four boys with entirely different personalities come together, the Mutation chooses them. Now, they must learn to hide their secrets of transformation, survive high school, stop an ancient evil from rising and learn the secret art of Ninjutsu in their new form as... turtles? (2k12 verse, Human AU)