|Season 1, Episode 11|
|Premiere||December 8th, 2012|
|Written by||Kenny Byerly|
|Directed by||Michael Chang|
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Panic in the Sewers
It Came From The Depths
"United by brotherhood, divided by skill"
When simultaneous threats from the Purple Dragons and Baxter Stockman's mechanical Mousers force the Turtles to split up into two groups, Michelangelo and Donatello try to prove that their 'B Team' is just as valuable as Raphael and Leonardo's 'A Team'.
This episode begins with the Turtles in the middle of one of their weekly training sessions. As per usual, Raph initiates an arguement between Leo and himself. Master Splinter, having had enough of this bickering, strikes the pressure points in their throats and tells the two of them that competition is supposed to motivate to them, but not to the point where they start beating up on eachother. He then tells them to fight alongside eachother against Donnie and Mikey. Leo and Raph hesitate, as they believe themselves to be much stronger warriors than their brothers. However, Mikey and Donnie quickly accept the challenge, but are overwhelmed by their brothers' utter strength.
Meanwhile, Dogpound informs the Shredder that he has intimidated the Purple Dragons into increasing the Foot Clan's cut of their take to 80%. This indicates to the Shredder that Dogpound's mutant form has its advantages, in stark contrast to Xever, who has no way of leaving his aquarium 'imprisonment'. Dogpound revels in his rival's predicament, torturing him by tapping loudly on the glass, which creates a sound effect that gives Xever a headache. Xever then dares Bradford (Dogpound) to come into the water so that he can harm him, but the Shredder tells Xever to stop and that, right now, he is in no position to be a fighter. This causes Xever to back down. The Shredder then orders Dogpound to find him the information about Splinter that he could use...or else Dogpound will receive another small punishment.
Back at the Lair, Raph and Leo are still giving Mikey and Donnie a hard time about their roles in the team and, after they all watch a Space Heroes episode where two minor characters are disparaged for doing nothing in the face of danger, Raph and Leo label Mikey and Donnie 'The B Team'. April then comes into the lair after having been mugged for her phone by the Purple Dragons. The Turtles instantly decide that they should teach the gang a lesson and get that phone back, but Splinter cautions that a simple cell-phone cannot be worth the risk of a large battle and April agrees with this. However, the boys believe that the gang can cause them no harm and go anyway, leaving Splinter and April to continue her Kunoichi training.
The Turtles bust into the Purple Dragons' hideout and easily defeat the gang, with Leo and Raph carrying the fight, much to Donnie and Mikey's utter annoyance. They demand to see the gang's stash of stolen goods, with Leo mentioning that they want an item stolen from a friend of their's. Just after they walk a short distance to the gang's stash and locate April's phone, the building begins to shutter and dozens of small, bipedal robots with big, fang-filled mouths burst through the floor and proceed to escape with the gangs' valuables in their mouths. The Turtles take out the remaining robots, but, during the confusion, the gang leader, Fong, is able to escape the building with April's phone in his hand. Leo orders the "B team" to go after the phone at all costs, while he puts himself and Raph in charge of destroying the robots. Donnie and Mikey comply, still stung by all of the "B team" comments. Leo and Raph follow the tunnel dug by the robots, as do the two remaining Purple Dragons, in secret. Leo and Raph soon emerge in an old warehouse and discover that Baxter Stockman is the person behind the creation of these robots. He created these "Mousers" (Mobile Offensive Underground Search Excavation (and) Retrieval Sentries) to not only steal for him and to make him extremely rich, but also to annihilate the Turtles and those who wrong him. Suddenly, he sprays Leo and Raph with a red mist that seems to be harmless at first, but somehow causes the Mousers to home in on them relentlessly. The two Turtles easily destroy the few Mousers that are around Stockman, who then reveals that he has hundreds more hidden a secret compartment. The boys retreat with an army of robots on their heels. As Stockman begins to gloat, he is hit in the back of the head and abducted by the Purple Dragon members Tsoi and Sid. Leo and Raph are chased all across the city, fighting as they go. They try to use every tactic that they know of to fool the robots, but they can't. They try to use a nearby water pipe to rinse the spray off, but to no avail. They know in the back of their heads that their most ideal option would be to call Donnie and Mikey for help, but Leo and Raph want to avoid being exposed as 'weak' in front of their younger brothers. They keep on fighting, but the supply of Mousers seems to be limitless and the two turtle brothers are beginning to tire out. Leo finally has to step up and call Donnie for help.
Meanwhile, Mikey and Donnie have trailed Fong to a defunct futon factory, where the Purple Dragon member hands April's phone over to Dogpound, telling him that it belongs to a close friend of the Turtles. Not long after, the two other gang members show up with Stockman. Dogpound, after being told the things that Stockman has done, wants Baxter disposed of, but the scientist mentions that his Mousers are destroying two of the Turtles at the very moment. Dogpound realizes that they both have a mutual hatred for the Turtles and orders the robot-maker to hack into April's phone, as he is good with electronics. With it's built in GPS system, the Foot should be able to see every place that the phone has been, including The Sewer Lair, which means that they can know Splinter's exact coordinates. Meanwhile, Donnie answers Leo's call for help, but Leonardo ultimately denies that he needs any help and is somewhat shocked when he hears that Mikey and Donnie are actually getting somewhere in retrieving the phone. Leo then hangs up on him. Donnie has come up with several possible ways to snatch the phone, one of which includes making the bad guys think that the police have arrived, while Mikey has come up with a name for every idea. However, the two finally settle on cutting the power to the building and snatching the phone in the darkness while Dogpound's senses are (hopefully) briefly impaired. The two almost succeed in this, but are caught by Dogpound, who hears their movements and chains them to a wall.
Meanwhile, Raph and Leo have decided to run away from the Mousers. The two do end up making light work of the robots, especially when they collapse a street light that comes into contact with water from a fire hydrant, electrocuting the Mousers in the vicinity. However, Leo and Raph are confronted by even more, forcing Leo to call Donnie for a second time. Dogpound finds Mikey and Donnie's T-Phones when they start ringing, and takes them away. Before they can be hacked into, however, Donnie commands the phones to self-destruct and both of them blow up in Dogpounds hands. Just as Baxter is about to finish uploading a decryption program onto April's phone, Raph and Leo burst in. Stockman demands to know how they escaped from his Mousers and Leo simply replies "We didn't." As the robot horde crashes into the room from above, Leonardo frees his brothers with his Katana blades, while the three Purple Dragons flee in panic. Mikey gets his hands on April's phone and barely manages ro keep it away from Dogpound, who starts chasing him. Donnie figures out how the Mousers have been tracking Raph and Leo. The red spray is some sort of radio-isotope that the Mousers were programmed to detect with a device on top of their heads. The chemical cannot simply be washed off and must be worn off over a gradual period of time, but if someone were to be sprayed now, they would give off a much stronger signal. Thus, Raph hits Stockman's spray can with two Shuriken, causing the isotope spray to backfire and blast Dogpound and Stockman. The Mousers suddenly attack those two. Dogpound finally gets his hands on April's ringing phone, but it gets knocked away and obliterated by a Tanto thrown by Donnie. Dogpound flees, grabbing Stockman along the way and bursts through a brick wall with a few dozen Mousers following him. Leo and Raph congratulate Donnie and Mikey and Raph now dubs them the "A minus team", because of their efforts. Donnie muses that this is probably the best that they will get out of him.
Back at the Lair, all of the brothers relax. Mikey break-dances and Raph feeds Spike leaves, while Leo and Donnie play some pinball together. Splinter enters the scene and tells the Turtles that, by choosing their battles poorly, they created their own crisis to deal with. Leo then gives April her (broken) phone back, but it shatters in her hands. Leo comments that the important thing is that the phone did not end up in the wrong hands. In spite of Leo's words, April is upset, but Donnie shows her a T-Phone and offers to replace her old phone with it. However, Mikey immediately - and accidentally - causes the T-Phone to self destruct once she has received it.
At the Foot Clan HQ, Dogpound, after having narrowly escaped the Mousers, arrives with Baxter and sets him down on the walkway. The Shredder appears and criticizes Baxter for his interference, sneering that Stockman should pay the ultimate price for it. Despite the Shredder's anger, he acknowledges that he has use for Stockman's skills and the episode comes to an end with Dogpound motioning his hand and Baxter looking at him in fear.
"One cannot predict the consequences of battle. Every fight has the potential to stir a hornets' nest."
"By choosing your battles poorly, you create your own crisis."
"The best warrior is not the smartest or the strongest. The best warrior is the one who is cares the most."
- The original title for this episode was Mouserthon.
- Just before April's phone is broken her caller I.D flashes the name "Irma" and a close-up of a pair of bespectacled eyes. This is a nod to Irma Langinstein; April's best friend and coworker from the 1987 cartoon series.
- In an episode of "Space Heroes" the Captain calls two crew members "you in the shirts". This is a nod to the the "Red Shirts" from the original Star Trek series, emphasized by the fact that the two crew members are immediately killed.
- When the Mousers are revealed, Stockman explains the acronym Leo mentions that it sounds a bit forced. This is because, in older incarnations, the Mousers were designed to seek and destroy rats and other rodents, hence their name. The makers of the 2012 show had to justify calling them "Mousers" somehow and came up with this somewhat stretched acronym.