The turtles brought their younger sister(Or brother) to her first mission.

Foot Recruit: "Master Shredder, Destroy, your enemies!"

Splinter: "Brace yourselves!"

Raph pulls Mikey in his arms before the Shredder swipes at them, knocking the pair into a wall. Raph was unconscious. Then Donnie smacked Shredder out of the way with his tech bo staff. Leo grabbed his odaci and prepared to make a portal when they heard a scream. It was Donnie under Shredders metal boot.