Name: Leatherhead

Designer: Ryan Brown

First Appearance: Tales of the Teenage Mutant Ninja Turtles #3

Game Appearances:
TMNT III: Manhattan Project
TMNT IV: Turtles in Time
TMNT: Hyperstone Heist
TMNT 2: Battle Nexus
TMNT 3: Mutant Nightmare (DS)

Profile: In the original Mirage comics, Leatherhead is subjected to MUTAGEN by the Utroms and transforms into his mutated self. He is shown to be highly intelligent and even befriends the turtles.

In the 1987 cartoon, he is a bumbling Cajun who hails from Florida and became mutated due to wasted MUTAGEN from Shredder and Krang. His character is played much more broadly compared to his more mellow Mirage counterpart.

Name: Rat King

Designer: Jim Lawson

First Appearance: Tales of the Teenage Mutant Ninja Turtles #4

Game Appearances:
TMNT IV: Turtles in Time
TMNT: Tournament Fighters (SNES)
TMNT 3: Mutant Nightmare (DS)

Profile: Rat King is one of the more poetic villains of the TMNT cast, with his ragged appearances and philosophical views. He is shown to have a telepathic connection with rats, which affects Splinter greatly in the Mirage comic books

In the cartoon, Rat King is still highly intelligent, however in this version is shown to control rats via a flute melody rather than with telepathic capabilities. In every version, he remains very dangerous and incredibly strong.

Name: Karai

Designer: Kevin Eastman, Peter Laird

First Appearance: Teenage Mutant Ninja Turtles #54

Game Appearances:
TMNT: Tournament Fighters (SNES)
TMNT: Tournament Fighters (Genesis)
TMNT 2: Battle Nexus
TMNT 2007 (GBA)
TMNT: Smash-Up
TMNT: Arcade Attack

Profile: In the original comic, Karai comes from the Japanese section of the Foot, who comes to New York after the demise of the Shredder in order to unite the clan and take over as its leader. Her relationship with the TMNT is either as an reluctant partnership or a revered adversary.

Karai did not appear in the 1987 cartoon or Archie, but would become central in the 2003 reboot and 2007 movie. In 2k3, her persona is similar, though she has now become the adoptive daughter of Shredder.

Name: Armaggon

Designer: Stephen Murphy, Peter Laird

First Appearance: Mighty Mutanimals #7

Game Appearances:
TMNT: Tournament Fighters (SNES)

Profile: Only appearing in the Archie comic books, Armaggon is an incredibly dangerous foe from the future, who seems to have had battles with Ray Fillet in the future.

Name: War

Designer: Peter Laird

First Appearance: Mighty Mutanimals #4

Game Appearances:
TMNT: Tournament Fighters (SNES)

Profile: War is one of the four horsemen employed by Null to take down the Ninja Turtles and Mutanimals. He has the ability to shoot explosive spikes from his hands.

Name: Wingnut

Designer: Ryan Brown

First Appearance: Teenage Mutant Ninja Turtles Cereal comic

Game Appearances:
TMNT: Tournament Fighters (SNES)

Profile: Originally a one-shot character from the comic book that came with a cereal. Wingnut would later appear in a greater role in the Archie comics as the last of his species from Dimension X, partnered with Screwloose, a mosquito.

In the 1987 cartoon, Wingnut and Screwloose are said to be from Planet Flagenon. There they are on a mission to conquer Earth.

Name: Chrome Dome

Designer: Michael Dooney

First Appearance: Planet of the Turtleoids

Game Appearances:
TMNT: Tournament Fighters (SNES)

Profile: In the 1 hour special Planet of the Turtleoids, Chrome Dome is a giant robot built by Shredder to lead the Foot and eliminate the Ninja Turtles. He later reappears for another episode, Night of the Rogues. His size was humanized for his appearance in Tournament Fighters, based closer on his action figure appearance.

Name: Triceratons

Designer: Kevin Eastman, Peter Laird

First Appearance: Fugitoid #1

Game Appearances:
Manhattan Missions (IBM PC)
Tournament Fighters (Genesis)
TMNT 2: Battle Nexus
TMNT: Arcade Attack

Profile: An alien race that has appeared in most of the TMNT versions. Triceratons were actually designed before TMNT in 1983 at Mirage. Their own home planet has been destroyed, and most of their appearances in the comics and cartoons have them on the wrong side of the Earthly laws.

Appearing in only 1 episode in the 1987 cartoon, Triceratons were given a prominent role in the 2k3 series at it progressed.

Name: Hothead

Designer: Ryan Brown

First Appearance: Teenage Mutant Ninja Turtles Adventures #20

Game Appearances:
Tournament Fighters (NES)

Profile: As a human, Hothead is Chu Chi, an Asian-American firefighter who uses an ancient relic to save people trapped in an inferno, only to become the Warrior Dragon, a giant sized dragon. Eventually Chi learns to control his transformation and bring his size down to a more appropriate proportion. He is shown to have a relationship with April in Adventures.

Warrior Dragon was never referenced as Hothead in the comic book, however the action figure and the Tournament Fighters video game gives him this name.

Name: Traag

Designer: Kevin Eastman, Peter Laird

First Appearance: Hot Rodding Teenagers from Dimension X

Game Appearances:
TMNT: The Arcade Game
TMNT: Fall of the Foot Clan
TMNT II: Back from the Sewers
TMNT III: Manhattan Project
TMNT IV: Turtles in Time

Profile: One of Krang's most loyal servants from Dimension X. Traag is a stone general fighting against the Neutrinos who are rebelling against Krang's army.

He appears as a boss in several video games, and his identical looking underlings show up as enemies.

Name: Granitor

Designer: Kevin Eastman, Peter Laird

First Appearance: Hot Rodding Teenagers from Dimension X

Game Appearances:
TMNT: The Arcade Game
TMNT: Fall of the Foot Clan
TMNT II: Back from the Sewers
TMNT III: Manhattan Project

Profile: The sharp nosed stone warrior is Lt. Granitor, Traag's partner in crime and loyal servant of Krang.

Name: Dirtbag

Designer: Michael Dooney

First Appearance: Planet of the Turtleloids

Game Appearances:
TMNT III: Manhattan Project
TMNT III: Radical Rescue

Profile: Dirtbag is a mutant military mole with a rivalry with Splinter. In the 1987 cartoon, he appears alongside Groundchuck as his partner as they serve Shredder.

Name: Groundchuck

Designer: Michael Dooney

First Appearance: Planet of the Turtleloids

Game Appearances:
TMNT III: Manhattan Project

Profile: Groundchuck is a mutated ox with technological augmentation. He is armed with electropods and a large crossbow, and is Dirtbag's friend and partner.

Name: Scale Tail

Designer: Ryan Brown

First Appearance: TMNT III: Radical Rescue

Game Appearances:
TMNT III: Radical Rescue

Profile: Scale Tale is one of Krang's most dangerous allies, a menacing bounty hunter from Dimension X. He is hired to kidnap the Ninja Turtles and Splinter to be brought to Shredder's Fortress. His only appearance in any TMNT media is in Radical Rescue.

Name: Scratch

Designer: Ryan Brown

First Appearance: Teenage Mutant Ninja Turtles Adventures #27

Game Appearances:
TMNT III: Radical Rescue

Profile: Scratch was formerly Pookey, a regular cat whose owner was dumping chemical waste. In a daze of anger, his owner threw him into the chemicals, resulting in him mutating and taking on the name Scratch. He becomes a criminal and enemy of the TMNT.

Name: Shogun

Designer: Kevin Eastman

First Appearance: TMNT II: The Arcade Game (NES)

Game Appearances:
TMNT II: The Arcade Game (NES)

Profile: Shogun is a robotic samurai and inhabitant of Sector Six in the Oead Star Zone, and the master of the Ultimate Galactic Sword. He is an alien bounty hunter much like Tora, and brought in by Shredder to take out the turtles. He is said to have built more lethal robots to defend his castle in Sector Six.

Shogun was designed exclusively for The Arcade Game.

Name: Tora

Designer: Kevin Eastman

First Appearance: TMNT II: The Arcade Game (NES)

Game Appearances:
TMNT II: The Arcade Game (NES)

Profile: A 2000 year old bounty hunter from space, hired by Shredder to take down the TMNT and cast a blizzard storm over NYC in the heat of the summer. Tora stands 10 feet tall and hails from the planet Traglodoon.

Tora was one half of the duo created exclusively for the NES port of The Arcade Game.

Name: REX-1

Designer: Kevin Eastman, Peter Laird

First Appearance: New York's Shiniest

Game Appearances:
TMNT II: Back from the Sewers

Profile: Short for Robot Enforcement Experiment, REX-1 is the loyal NYC robocop who stands by April's side no questions asked. His designs are stolen by Shredder to produce a mass army of evil REX-1's, but they are defeated by the heroes in green and REX.

Name: Chunky Cheese Pizza Monsters

Designer: Ryan Brown

First Appearance: The Case of the Killer Pizzas

Game Appearances:
TMNT II: Back From The Sewers
TMNT IV: Turtles in Time
Hyperstone Heist

Profile: Formed from eggs found in Dimension X. Shredder disguises the eggs as meatballs on pizza and lures out the TMNT with a fake pizza contest.

Their appearance is heavily based on HR Giger's Alien design.

Name: Tokka

Designer: Stephen Bissette

First Appearance: Teenage Mutant Ninja Turtes 2: Secret of the Ooze

Game Appearances:
TMNT III: Manhattan Project
TMNT IV: Turtles in Time

Profile: Originally conceived as a toy under the name Terrorpin. Tokka is one of the new mutants created by Shredder in the second live action movie along with Rahzar. He was originally an alligator snapping turtle. Despite him being a baby, he has remarkable strength and is extremely dangerous due to his childlike anger.

Tokka is shown to have a weakness for food, especially donuts.

Name: Rahzar

Designer: Kevin Eastman

First Appearance: Teenage Mutant Ninja Turtes 2: Secret of the Ooze

Game Appearances:
TMNT III: Manhattan Project
TMNT IV: Turtles in Time

Profile: Rahzar is a mutant gray wolf made by Shredder to deal with the TMNT after the Foot Clan's failure to do so during the events of the first TMNT live action movie. Like Tokka he is extremely childish in nature due to being a baby when exposed to the MUTAGEN, but at the same time also extremely strong and lethal. He consider Shredder his "mommy"

He also shares Tokka appetite for donuts and food.

Name: Fugitoid

Designer: Kevin Eastman, Peter Laird

First Appearance: Fugitoid #1

Game Appearances:
TMNT II: Battle Nexus
TMNT III: Mutant Nightmare
Smash-Up

Profile: Fugitoid's real name is Professor Honeycutt, transformed due to an accident during his experiments. He is heavily involved with the making of a powerful teleportation weapon used in the Triceraton war. He later aligns himself with the TMNT. His design was made before the TMNT in 1983.

Fugitoid never appeared in the 1987 cartoon or video games, though did receive an action figure. A certain enemy in Manhattan Project bears a resemblance to him, but is a different character altogether.

Name: Utrom

Designer: Kevin Eastman, Peter Laird

First Appearance: Teenage Mutant Ninja Turtles #3

Game Appearances:
TMNT II: Battle Nexus
Smash-Up

Profile: A brain like alien race which are responsible for the creation of MUTAGEN and lives disguised among ordinary humans through the use of their exo-skeleton suits. As a race, Utroms ranges from dangerous to intelligent and friendly.

In the 1987 cartoon, Utroms are partially represented in the form of Krang, though they are no of similar origin. Utroms would play a central role in the 2k3 cartoon series.