Casey catches Angel, a young girl he knows from the neighborhood, going through an initiation to join the Purple Dragons. Casey, who promised Angel's grandmother that he'd keep her out of trouble, fears that she's going down the wrong path and tries to stop her from joining the gang with the help of the Turtles.

''First appearance of Angel''
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!!This episode provides examples of:

* AccessoryWearingCartoonAnimal: {{Lampshaded}} when Leo complains that wearing clothes (as a disguise) is cumbersome, and he can't understand how humans wear them all the time.
-->'''Leo''': Geez, I can barely move in this stuff! What is the deal with humans and clothes?
-->'''Raph''': You ever seen a human in his skivvies? [[NoodleIncident Trust me,]] it ain't a pretty sight.
* AndThisIsFor: When Casey prepares to deliver the final blow to Hun during their fight, he says "This one's for my dad."
* ContinuityNod: Raph refers to the previous episode, "apologizing" for escaping from Hun's boat. Hun is quick to retort that the "escape" was just a TrickAndFollowPloy.
* DirtyCoward: When the Turtles and Casey confront the Purple Dragons in the beginning, Dragon Face orders them to attack while he himself retreats.
* DisappearedDad: Hun brags about burning down Casey's father's store and hinting that he killed him. Casey tells Hun, "at least I ''had'' a father".
* DramaticUnmask: [[InvertedTrope Inverted]] in the ColdOpen, when Hun hoists an unmasked Casey and announces that the winner of the Cage match will get to off the Purple Dragons' most hated enemy. This only results in confusion among the Purple Dragons, until he puts Casey's hockey mask on his face and they immediately recognise him as the crazy vigilante that has been getting in their way.
* EqualOpportunityEvil: The Purple Dragons are shown to have a few females in their ranks. They also don't seem that bothered about the idea of Angel joining them.
* FantasticallyIndifferent: Angel's reaction of seeing four mutant turtles? Calling them off the charts.
* HeelRealization: Seeing Casey getting hurt and locked up by Hun show Angel the error of her ways.
* InsistentTerminology: When Raph's cover is blown, Dragon Face calls him a "kung-fu lizard", in which Raph attempts to correct him.
-->'''Raph''': Turtles! Tur-tles! Don't any of you lame brains know a turtle when you see one?!
* ItsAllMyFault: Angel blames herself for Casey getting captured by the Purple Dragons.
* MeaningfulEcho: When Casey stops Angel after robbing a store and again when she stops him from killing Hun.
--> "What are you doing?" "Stopping you from making the biggest mistake of your life."
* MythologyGag: The Turtles' hideout is revealed to be on the corner of Eastman and Laird, a nod toward the creators of the original comic.
* {{Narrator}}: Casey's first one.
* PaperThinDisguise: The Turtles disguise, street clothes Angel gave them, are able fool the Purple Dragons and get them into their hideout to rescue Casey.
* RaisedByGrandparents: Angel lives with her grandmother, who also happens to be one of Casey's neighbors[[note]]A later episode reveals that Angel also has an older brother named Ryan (who's a construction worker) and that they've been living with their grandmother ever since their parents died[[/note]].
* ShoutOut: One of Mikey's descriptions of Raph's disguise is [[Franchise/StarWars Stormtrooper]].
* SingleTear: Casey, sheds a [[TearsOfJoy single tear of joy]] when Mikey tells him he has "a present" and gives him his bat.
* YouExclamation: Hun says one upon meeting Raph again from the previous episode.
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