Metalhead Rewired

Metalhead Rewired is the thirty-seventh episode of the 2012 series. It aired on Febuary 23, 2014.

Synopsis
After Donnie upgrades Metalhead's artificial intelligence, the other Turtles become suspicious of the new, sentient Metalhead. At the same time, the Turtles stumble upon the Kraang's plot where they have been capturing the mutants (ranging from Snakeweed, Spider Bytez, Dr. Tyler Rockwell's mutant form, Pete, a Parasitic Wasp, Kirby O'Neil's mutant form, Slash, and a Squirrelanoid) so that they can control them.

Major Characters

 * Donatello
 * Leonardo
 * Metalhead
 * Michelangelo
 * Raphael

Minor Characters

 * Dr. Tyler Rockwell
 * Kirby Bat
 * Justin
 * Parasitica Wasp
 * Pete
 * Slash
 * Snakeweed
 * Spider Bytez
 * Splinter
 * Spy-Roach
 * Squirrelanoid
 * Newtralizer

Cast

 * Sean Astin as Raphael
 * Jason Biggs as Leonardo
 * Greg Cipes as Michelangelo
 * Rob Paulsen as Donatello
 * Hoon Lee as Splinter
 * Nolan North as Kraang
 * Lewis Black as Spider Bytez
 * Corey Feldman as Slash

Plot
The episode opens up with Metalhead's point of view, observing the four Turtles looking at him. Donatello then reveals to his brothers that he has vastly upgraded Metalhead's A.I. in order for him to effectively work alongside the Turtles (and listen to their every command). Donnie has also apparently programmed him with the ability to successfully simulate dozens of fighting styles and abilities, such as that of both the Foot Clan and the Kraang. After some banter and a brief training session, Metalhead's improved fighting skills are noted to be VERY effective - after the robot is shown to easily prevail against all four of the brothers at once in combat, much to even Master Splinter's surprise, whom also has several choice words with Donnie and tells him that he must be sure to use his creation wisely (and not allow it to go over the top and become hostile towards the other Turtles).....

When one of the security wires is randomly tripped outside and sets off Metalhead's vocal alarm, the Turtles quickly set out to check who could be near the entrance to their lair, only to discover a very frenzied Spider Bytez being chased down by three armed Kraang droids there...Despite Spider Bytez pleading for the Turtles to possibly save him, he is captured by the Kraang up on the surface before he can explain at all what happened. Thanks to Donatello, however, Metalhead is already prepared for taking immediate action against this and he quickly arrives within the Shellraiser (using his degree of independence that was granted to him) in order to chase down the Kraang's truck (Leo is curious about what the Kraang could be up to, because it could wind up relating to them, as it often does).

After they catch up to the Kraang and their vehicle, quite a lengthy fight ensues on the streets, and Metalhead finally manages to crash into the Kraang's getaway after a short while. However, when the Turtles get out and mobolize to investigate, they realize that the vehicle and Spider Bytez have both disappeared inside of a large parking gargage (or a secret Kraang warehouse). While investigating the crash site for clues, Leonardo begins to show what seem to be signs of jealously towards Metalhead's brand new usefulness....When Michelangelo starts tugging on a nearby vending machine and accidentally locating what seems to be an obscure 'Kraang computer' behind it, Donnie instructs Metalhead to try and gain access into it's database to find any sort of potentially useful info, only to wind up destroying it entirely and harming himself, giving him the scorn of the other Turtles....

Back at the lair, Donatello diagnoses Metalhead's condition and states that he can only be fully repaired after "a while". Metalhead's lengthy repairs, however, begin to quickly eat away at the other Turtles's patience, until Leonardo finally orders Donatello to shut down Metalhead's A.I., informing Donatello that Metalhead is just too dangerous and unpredictable to use at the stage that he is in. Metalhead, however, overhears Leonardo's conversation and, very unwilling to be shut down, it locks all of the Turtles inside Donatello's lab and rapidly leaves somewhere...After being set free by Splinter, the Turtles quickly set off in the Shellraiser to find Metalhead, under the impression that it has gone rogue. Upon finding the robot using a tracking device that Donnie had managed to install, Metalhead steps into a Port-a-potty and disappears into it, much to the Turtles' utter confusion...To their luck, Michelangelo is somehow able to reveal that the port-a-potty actually has what appears to be a portal inside of it, which proceeds to suck them all into it....

Inside the portal, the Turtles discover that it leads to a secluded base that belongs to none other than The Kraang. The base also acts as a makeshift prison for every single one of the Mutants that had faced the Turtles in both the recent and distant past, all of which include; Snakeweed, Spider Bytez, Dr. Tyler Rockwell's mutated form, Pete, Justin, Spy-Roach, The Parasitic Wasps, Kirby O'Neil's mutated form, The Squirrelanoids, and Slash. The Turtles also notice Metalhead at the main computer of the base, revealing that Metalhead was actually on their side all along and that he is trying to both gain the Turtles' absolute trust and trying to rescue the other Mutants.

The Kraang, however, quickly catch on to this plan, and both the Turtles and Metalhead then work side by side to stop the invading droids. Despite the brief interference of both a brainwashed Snakeweed and Spider Bytez, Metalhead manages to rescue the Turtles, releases all of the captured Mutants from their numerous chambers, and manages to re-open the portal back to Earth. Despite the Mutants and the Turtles being able to escape, Metalhead is not able to leave, due to him being the only one to keep the portal operational and open. Despite the pleas of the Turtles, Metalhead orders them to leave, as there is not one other choice. After saying goodbye to Donatello for one very last time, Metalhead chooses to attack the main computer system there, destroying several Kraang droids nearby, along with himself in a rather big implosion.

Back on Earth, the Turtles find out that all that remains of Metalhead now is just his completely inactive head (which actually came up through the Portal along with them). Donatello then remarks that he ended up sacrificing himself to save all of them, even though he was not even programmed to do such advanced things....Leonardo then apologizes to  Donatello  for not trusting Metalhead so much, and the Turtles give a moment of silence for their fallen robotic ally, though Donatello hints that he might indeed repair Metalhead -- someday in the near future....

Trivia

 * When Metalhead attempts to hack the Kraang system and gets shocked it is very similar to the scene in Star Wars when R2D2 plugs into an outlet instead of an interface (due to C3PO's inability to tell the difference). Metalhead makes the exact same shrieking sound as R2D2 did.
 * On the back of the Port-a-Potty Portal there's a spray-painted "42!", which in the The Hitchhiker's Guide to the Galaxy is said to be "The Answer to the Ultimate Question of Life, the Universe, and Everything".
 * Metalhead constantly grabbing Mikey by the face is a gag that relates to Mikey's friend, Leatherhead, grabbing Donnie by the face in previous episodes.

Gallery
Metalhead Rewired/Gallery