Draxum created five turtles, all of them being different species, three of them were taken away, but Draxum never explained much of it. Only two being left, you and Donnie.

You and Donnie were siblings, you both were raised under Draxum's wing, being made to be warriors and help eliminate humankind.

Now, you and Donnie were currently on the run in the mystic city from the mystic police, you guys being criminals technically.