The turtles are 20 years old when this first starts but they get older Leonardo was coming back home from a patrol when he suddenly sees a baby girl crying in a box left in an alley way by her own. so Leo decides to take her home and raises her as his own. 1 year later Raph, Donnie and Mikey go on patrol when they hear kraang talking about something they go and check it out and see they have a little girl and two little boys. Raph, Donnie and Mikey take down the kraang and take the baby's the kraang had back home to raise them as their own too.