Pretty goofy, as you can imagine. Splinter's finally stopped caring whether the Turtles are seen or not, and agrees to let them see what high school is all about. In order to fit in amongst the youth, they don their usual trench coats and fedora disguises, naturally. Leo ends up uncovering a homework copying ring ran by a gang of punks, and Michaelangelo saves the day when he threatens to scald them with a bucket of molten chocolate.
Splinter inscrutibly sends the Ninja Turtles to human junior high school one day. He packs them sack lunches and they all wear fedoras and trenchcoats so as to blend in with their peers.
At the end of their first (and only) day of school, they use the skills they have learned in class to foil a gang of bullies.
Pretty average as far as the genre goes.
This entire review has been hidden because of spoilers.