The Foot Clan is a ninja criminal organization that was founded 1,500 years ago in Japan by a ninja named Koga Takuza when he forged an alloy stronger than steel from the stolen sacred totems of his defeated adversaries to fashion a helmet known as the Kuro Kabuto.
The Kraang are a race of brain-shaped aliens from Dimension X, piloting robotic bodies called Kraangdroids that are responsible for bringing some mutagen to Earth a thousand years ago.
Among the Dimension X creatures are: The Purple Dragons are a Chinese-American street gang that has been extorting shop owners for protection money in the Lower East Side and Chinatown.
Among the known Triceratons are: In addition to the Kraang, there are many other alien species throughout the show that are listed in alphabetical order: The Aeons is an ancient alien race of benevolent, ethereal beings that hail from the planet Zalvadal, a world of vast, beautiful gardens and tranquility that contains all of the sacred knowledge in the cosmos.
The very source of all their strength is a mighty crystallized artifact called the Sol Star, containing the very essence of power and life itself.
However, they were not have been aware of how the Sol Star fragment was gradually corrupting April to the point of insanity, in addition to further developing and magnifying most of her psionic abilities to tremendous levels as well as awakening an evil Aeon named Za-Naron.
Among the known Aeons are: The Daagon is a race of aquatic fish-like aliens that reside in the cosmic ocean of Varuna, a liquid nebula over which they rule.
Among the known Utroms are: The following alien creatures are listed in order of appearance: The following characters appear in the TV shows that are watched by the Turtles in each season: Space Heroes is a fictional animated science fiction TV series that is Leonardo's favorite show in Season 1.
Super Robo Mecha Force Five is a 1980s anime show that was discovered by Michelangelo in Season 2.