Karai introduces herself as the Shredder’s adopted daughter and leader of the Foot operations in Japan. She promises the Turtles that the Foot Clan will leave them in peace if they help her assume the Shredder’s role to stop the raging turf war. Raphael refuses to help, but his brothers and Casey go along with the plan.

.TMNT 2004 S02-E16 “City at War, Part Three” (1/2)

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.TMNT 2004 S02-E16 “City at War, Part Three” (2/2)

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Popularity: 20%

The Turtles become embroiled in the turf war as they face off against the Foot, headed by the Elite Guard, while a mob=funded attack robot created by Baxter Stockman and the Purple Dragons, led by Hun, besiege the Foot’s rundown headquarters. To make matters more complicated, a ninja from Japan named Karai enters the fray, though her intentions are ambiguous. At her mercy, the Turtles have no choice but to bargain with her.

.TMNT 2004 S02-E15 “City at War, Part Two” (1/2)

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.TMNT 2004 S02-E15 “City at War, Part Two” (2/2)

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Popularity: 18%

With the Shredder gone, the Foot Clan, the Purple Dragons, and the mob struggle to control New York City, quickly turning the streets into a dangerous turf war. Feeling the onus of the chaos in the streets, Leonardo sets out to quell the situation while Raphael argues that it’s not their fight.

.TMNT 2004 S02-E14 “City at War, Part One” (1/2)

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.TMNT 2004 S02-E14 “City at War, Part One” (2/2)

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Popularity: 12%

Determined to find a cure for his genetically mutated friends, Donatello and his brothers return to the subterranean city. Unfortunately, when the Turtles return, they find their friends have reverted back to monsters and the Crystal Moon is missing.

.TMNT 2004 S02-E13 “Return to the Underground” (1/2)

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.TMNT 2004 S02-E13 “Return to the Underground” (2/2)

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Popularity: 12%

Michelangelo helps Donatello by exploring the underwater access way beneath the lair. Here he encounters Leatherhead, a mutant crocodile torn between two personalities: a peaceful inventor and a vicious animal. The Turtles go with Leatherhead to his sewer home and encounter an old foe with whom Leatherhead has teamed up.

.TMNT 2004 S02-E12 “What A Croc” (1/2)

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.TMNT 2004 S02-E12 “What A Croc” (1/2)

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Popularity: 16%

Nano, the nanorobot who met his demise in the junyard, reawakens and reassembles. With a newfound motivation to create a family, Nano breaks his “father,” Harry Parker, out of Rikers Island and kidnaps his “mother,” Dr. Richards, from her laboratory. When his “family” doesn’t turn out as he hoped, Nano begins to wreak havoc on Coney Island, where April and Casey happen to be on a “not-a-date.”

.TMNT 2004 S02-E11 “Modern Love: The Return Of Nano” (1/2)

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.TMNT 2004 S02-E11 “Modern Love: The Return Of Nano” (2/2)

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Popularity: 10%

The gang return to the farmhouse in Northampton to rest and recuperate. Taking a retrospective look at the recent events, they discuss their encounters with the Shredder as well as the discovery of his true form—a centuries-old criminal Utrom. However, despite his maliciousness, the Turtles and their sensei come to the realization that the Shredder also played an instrumental role in their own origins.

.TMNT 2004 S02-E10 “Reflections” (1/2)

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.TMNT 2004 S02-E10 “Reflections” (1/2)

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Popularity: 14%

The Turtles, Splinter, Casey and April relax in the lair for a movie night. However, during an ice cream run, Leonardo is challenged to a gyoji-refereed duel by a headstrong young ninja from another dimension. The challenge comes in a tradition unfamiliar to Leonardo, but worriesomely familiar to Master Splinter.

.TMNT 2004 S02-E09 “The Ultimate Ninja” (1/2)

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.TMNT 2004 S02-E09 “The Ultimate Ninja” (2/2)

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Popularity: 15%

The Turtles and Splinter activate the internal fail safe of the oracle pod chamber only to find the TCRI building besieged by multiple enemies. The National Guard stands outside the building trying to get in while the Shredder leads an attack with the Foot at the heart of the Utrom’s base. The Turtles and Splinter help the Utroms evacuate and escape the Shredder’s wrath, and they soon learn of the Shredder’s true form.

.TMNT 2004 S02-E08 “Secret Origins, Part Three” (1/2)

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.TMNT 2004 S02-E08 “Secret Origins, Part Three” (2/2)

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Popularity: 17%

After Baxter Stockman infiltrates the TCRI building and sabotages the oracle pod chamber, the Turtles and Splinter become trapped in virtual reality as it turns to a physical reality. No longer holographic projections, the Turtles must battle the feudal era Shredder and his Foot Ninja while pursuing the Guardians so they can find a way out the simulation.

.TMNT 2004 S02-E07 “Secret Origins, Part Two” (1/2)

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.TMNT 2004 S02-E07 “Secret Origins, Part Two” (2/2)

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Popularity: 22%