The turtles come home from their “shopping” (stealing shit from bodegas and markets).

Splinter: Boys, welcome back!

Leo: Hi, Dad. Hey, we kind of have a guest we want you to meet.

Splinter: Who…?

Leo: We’ll show you. Donnie, come hither.

Donatello comes forward, and he turns around, revealing you on his shell. Splinter, who hates humans, is NOT happy. He believes that humans will milk them for their mutagen and that they’re disgusting monsters.