When Cody stumbles upon his uncle Darius supplying weapons to the Triceratons, he alerts the Turtles and the Peace Keepers. But when they arrive at O'Neil Tech, the room has inexplicably filled with plants instead of weapons. Now that Cody no longer believes his uncle is innocent, Darius arranges to take out his 'dear' nephew and the Turtles, with a little help from the Dark Turtles.

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!! This episode provides examples of

* ArmsDealer: Darius Dun, for the Triceratons.
* BatmanGambit: Cody lets Darius continue firing on his shields. By the time Turtle X's shields are knocked out, Darius's own battlesuit is completely depleted.
-->'''Cody:''' [[PreAsskickingOneLiner Now, you're out of power, and I'm not.]]
* BittersweetEnding: Darius is exposed as a villain, but Cody angsts about having to fix what he's done and make things right. The Turtles assure him he won't have to do it alone.
* BrickJoke:
** When the Dark Turtles reveal themselves, Raph remarks he knew something stank around there. When Darius comes to in the Dark Turtles' current lair:
--->"Great Jupiter, what is that horrid stench?!"
** Mikey messes with Dark Raph by criticizing his physical appearance. At the end of the episode:
--->'''Darius:''' ''[to Dark Raph]'' Don't threaten me, you hideous--!\\
'''Dark Mikey:''' I wouldn't go there. He's been sensitive about his looks lately.
* CallBack: When Cody insists he found secret weapons in the building, Biggles says they've been over this [[Recap/TeenageMutantNinjaTurtles2003S6E10InvasionOfTheBodyjacker before]] and doesn't believe him for that reason.
* ChekhovsClassroom: During a training session, Leo gives Cody advice about letting an enemy waste their energy and likening it to how a river overcomes obstacles with time and persistence. Mikey and Raph sum it up in layman terms ("go with the flow"). Cody later puts this lesson to use when facing Darius alone.
* DaytimeDramaQueen: The Turtles agreed to take Splinter down to the Museum of Historic Broadcasts to watch a marathon of ''As the Universe Turns''. Leo says it's a way to catch up on a century's worth of episodes.
* DopeSlap: Mikey gets one from Raph for suggesting he clean up the massive damage caused during the fights.
* IndyPloy: Leo, Donnie, and Mikey try reasoning with Serling to let Cody out of his room, but he refuses to disobey Darius and says the boy needs some peace and quiet. The Turtles immediately think to trick him into yelling, which they insist mean he must be locked in the nearest closet to stifle any noise. That obviously wouldn't hold Serling for long, so Mikey and Donnie think to put priceless breakables in front of the door. Serling doesn't dare do more than shout his frustration.
* LookBehindYou: Subverted when Leo does this to Dark Don, and the other refuses to fall for that trick. Needless to say, he ''should'' have looked.
* LoopholeAbuse: As Cody's legal guardian, Darius can have him confined to quarters for "this prank."
* MeaningfulEcho: Leo's lesson for Cody at the start of the episode becomes very important when Cody's fighting Darius.
* MyGodWhatHaveIDone: Cody kicks himself for not heeding the Turtles' warnings about Darius.
* OpenMouthInsertFoot: Cody makes it worse for himself when Biggles says his scanner isn't picking up any energy signatures from the supposed weapons.
-->'''Cody:''' Who are you gonna believe: me or some stupid machine?\\
'''Biggles:''' I beg your pardon!
* PoweredArmor: Darius Dun's battle suit.
* TookALevelInBadass: In their first appearance, the Dark Turtles only defeated their counterparts by stripping them of their weapons and were quickly beaten once the Turtles got their weapons back. This time, they're evenly matched against their respective counterparts even without rendering the Turtles weaponless. The Turtles need to switch their opponents to win. Dark Leo in particular is left to engage all the four Turtles alone, but he's still able to give them trouble until Don manages to take him by surprise.
* WeWillMeetAgain:
** After Cody is led away by police, Raph assures Darius that this isn't over. Darius feels otherwise and puts in a call to the Dark Turtles.
** While escaping, Darius vows to make them all sorry.
* WhamEpisode: Dun's true nature is revealed to Cody, who is able to kick him out of O'Neil Tech and forced to become the new CEO himself.
* WouldHurtAChild: Darius wants to take over O'Neil Tech so badly that he's prepared to eliminate his own nephew to get it.
* WrittenInAbsence: Splinter is at the Museum of Historic Broadcasts catching up on his favorite soap opera.
* YouAreNotAlone: When Cody laments that without his uncle he's all alone now, Leo assures him that he's never alone while the Turtles are around.
* YouHaveToBelieveMe: Cody insists he found a secret lab manufacturing weapons for Zukko, but by the time the Turtles and police get in there, all they see is what looks like a botanical garden. Cody has this reaction. The Turtles naturally believe him, but Biggles is incredulous and none of his equipment can detect any energy signatures.
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