| 105 :05x01 - The Turtles and the Hare (1) (Sep/16/1991) | | The Turtles are forced to enter another dimension to recover a crystal capable of reversing the effects of Krangs' new Docilizer ray, which is turning human beings into timid creatures too afraid to retaliate in light of their oppressors, there, the Turtles meet Hokum the rabbit... | | Writer: Misty Taggart | |
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| 106 :05x02 - Once Upon a Time Machine (2) (Sep/17/1991) | | Krang discovers an opening in the space/time continuum and finds the means of transporting Shredder to the distant future. The Turtles' new friend Hokum accidentally stumbles on Shredders' time traveling and alerts the Turtles to help their future, and slightly age hindered selves, from preventing Shredders' conquest of tomorrow with the aid of Rocksteady and Bebops' former gang members. | | Writer: Michael Maurer | |
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| 107 :05x03 - My Brother, the Bad Guy (Sep/14/1991) | Shredder breaks into selected areas across the world, from Tokyo to aqquire a mysterious book, to infiltrating the holding pen of a fusion reactor, which conducts power to a large magnetic structure. Shredders' twin brother, an officer of law enforcement, follows his trail to New York and confronts the Turtles.
Keeping his relation to his brother a secret, Shredders' sibling allies with the Turtles, but will his attempts at preserving any law enforced rule from being broken hinder the Turtles and pave the way clear for Shredder to finally free The Technodrome? | | Writer: Dennis O'Flaherty | |
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| 108 :05x04 - Michelangelo Meets Mondo Gecko (Sep/19/1991) | | Michelangelo, disturbed by strange dreams of his past, is caught on several occasions by Modno Gecko, a member of a group of rouge mutants commiting a series of robberies for their master, a mysterious crime lord called "Mr. X", who has strange ties to Mikey's dreams. | | Writer: Gary Greenfield | |
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| 109 :05x05 - Enter Mutagen Man (Sep/21/1991) | | Shredders' efforts to perfect a new mutagen lead to the accidental transformation of delivery man Seymour Guts into a mutated monstrosity capable of mimicking the form of anyone he comes in contact with | | Writer: David Wise (3) | |
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| 110 :05x06 - Donatello's Badd Time (Sep/21/1991) | | Hillbilly crime clan The Badd Family hijack the Turtle Van, leaving Don with not just the Van to recover, but also to make sure his good standing with his brothers isn't tarnished, as they gradually begin to suspect their brother is aligned with the family. | | Writer: Misty Taggart | |
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| 111 :05x07 - Michelangelo Meets Bugman Again (Sep/24/1991) | | Michelangelo is dismayed to find the Bugman comic has been canceled, and his hero unable to become angry, finally at peace with himself. His help is needed however when the remaining Turtles battle a new threat called The Swatter | | Writer: David Wise (3) | |
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| 112 :05x08 - Muckman Messes Up (Sep/25/1991) | | Krang sends Shredder, Rocksteady, and Bebop to seize an anti-mutagen compound, but they inadvertently create two new mutants from garbageman, Muckman and Joe Eyeball, whilst fighting the Turtles. The new mutants soon realize that the Turtles are weakened whenever they come close, prompting an easy opportunity to seize April and Irma in retaliation for their condition | | Writers: Ted Pedersen, Francis Moss (1) | |
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| 113 :05x09 - Napoleon Bonafrog: Colossus of the Swamps (Sep/26/1991) | | Shredder returns to the Florida swamps to find the mutagen pool that birthed the Punk Frogs and Leatherhead, hoping to use some of the water to fuel a new mutagen shooter, he is confronted by Napoleon Bonnafrog, but the fight results in Napoleon mutating into a feral, giant frog whom Shredder brings back to New York to use against his enemies. | | Writer: Dennis O'Flaherty | |
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| 114 :05x10 - Raphael Vs. the Volcano (Sep/27/1991) | | Convinced he has only days to live thanks to the malfunction of Donatello's "Healthometer", Raphael becomes a masked vigilante called "The Green Defender" and fights crime with a near death wish resolve. A bitter scientist frustrated with not receiving credit for uncovering a new kind of plant threatens to destroy all plant life on the planet with a toxic-fueled volcanic eruption | | Writers: Carol Mendelsohn, Jack Mendelsohn | |
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| 117 :05x13 - The Ice Creature Cometh (Oct/02/1991) | | Rocksteady and Bebop create a ferocious Ice Creature by depositing a vat of mutagen around the artic surroundings, initially out of control, Shredder is able to manipulate it into following Rocksteady and Bebop's orders and orders it attack the city and distract the Turtles whilst he attempts to steal thermo explosives that can free The Technodrome | | Writer: David Wise (3) | |
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| 118 :05x14 - Leonardo Cuts Loose (Oct/03/1991) | | Leonardo becomes disgusted with his brother's insistence on building their muscles to overcome a group of crooked enforcers that succeeded in overpowering them, preferring to practice and refine his ninjitsu. He is soon forced to ally himself with Casey Jones when his brothers are captured by the same adversaries, and their employer, Wally Airhead, whose experiments in strength enhancement has made his minions a force to be reckoned with | | Writer: David Wise (3) | |
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| 119 :05x15 - Pirate Radio (Oct/07/1991) | | Shredder hijacks the pirate radio station WOOF, and uses it to mesmerize New York's citizens into heading towards the harbor, where they will become victims of an inter dimensional chasm created by Krang | | Writer: Misty Taggart | |
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| 120 :05x16 - Raphael, Turtle of a Thousand Faces (Oct/08/1991) | | Raphael, determined to prove he can be a master of disguise, takes the place of costumed vigilante Mad Dog Mcmutt, who has recently suffered amnesia. Raph is soon captured by enemies of Mcmutt, whilst the TMNT convince the real hero that he is Raphael so he can help them recover their brother in his confused state | | Writer: Dennis O'Flaherty | |
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| 121 :05x17 - Leonardo, Renaissance Turtle (Oct/09/1991) | | With his brothers and Master Splinter taking a vacation, Leonardo remains in the city to oversee the prowess of new Cyber cop LEX as he cleans up the streets, when it becomes apparent LEX and it's creator Professor Mindbender are plotting a takeover of the city, Leo and April reunite with former cyborg law enforcer REX-1 to take them out. | | Writers: Ted Pedersen, Francis Moss (1) | |
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| 122 :05x18 - Zach and the Alien Invaders (Oct/10/1991) | | Zach's habit of crying wolf enrolls him into a strict, hostile military camp run secretly by aliens Wingnut and Screwloose, who are scheming to brainwash the camp's cadets with a mind scrambler and use them to conquer the planet. Zach attempts to alert anyone he can, but finds his frequent lying has cost him trust and reliability, only the Turtles believe him, and they are soon captured. | | Writers: Ted Pedersen, Francis Moss (1) | |
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| 124 :05x20 - Michelangelo, the Sacred Turtle (Oct/15/1991) | | Michelangelo is mistaken for the reincarnation of Ahmed Turt-el, a legendary Pharaoh, and he leads his misunderstanding followers in a daring rescue mission to save April from the insane Egyptology's Sir Percival, who has stolen the fabled "Turtle's Eye" in an attempt to conquer the world. | | Writer: Dennis O'Flaherty | |
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| 125 :05x21 - Planet of the Turtleoids (Sep/07/1990) | | The Turtles battle two new mutant menaces created by Shredder, Groundchuck and Dirtbag, but in the midst of battle, both parties are taken to a distant planet of Turtle like aliens by the well meaning Turtloid Kerma. Finding the planet under threat by a two headed dragon known as Hermin The Horrible, the TMNT face the duel problem of defeating Hermin, and keeping Groundchuck and Dirtbag from taking over the Turtloid city themselves. Meanwhile, whilst the Turtles' away, the rats will play, and April is caught in the mouse trap, forced to bear witness to Shredder and Krangs' attempts to create a new Technodrome using Shredders' most lethal weapon yet, the cyborg Chromedome... | | Guest Stars: Jim Cummings as Dirtbag, Pat Fraley as Dirtbag | | Writer: David Wise (3) | |
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