After four baby turtles were mutated by toxic goo called mutagen they were trained in the art of ninjutsu by fellow mutant Master Splinter. The Turtles different fighting styles and personalities build off one another making them a formidable team of ninja warrior superheroes.

The original Teen Brigade were a group of teenagers that used Radio Hams to help the Hulk and the Avengers during their early years. More recently, a new Teen Brigade, a team of superheroes, have surfaced acting on classified SHIELD intel.

Native of Earth 11, they are an analogous team to the Teen Titans and Young Justice.

Coming from a far future where grow-ups died and only the younger descendants of Kyle Rayner could use the last power ring.

Teenage superteam to the Union in Jupiter's Circle

The Teen Team was a band of super-powered teenagers. Together they fought crime and global menaces until the team was disbanded in a cloud of drama and ambition.

The Teen Titans are the premier team of young heroes in the DCU. Currently led by Damian Wayne, the team fights for the greater good and to recruit other young heroes like them.

A former rival/alley group of Teen Titans.

Fictionalized cartoon version of the Titans.

A group of tech themed police who accuse Cyborg of stealing technology

A sect of the Guardians of the Universe who were locked away for eons to guard The First Lantern from ever escaping.

Police force from the 96th century charged with preventing the disruption of time by criminals attempting to alter the past.

The Temps Aeternalis is a group dedicated to preserving the timestream through and eliminations. One of the higher ups seems to be a super intelligent goldfish.

Army of the National Security Agency whose members fought against Green Arrow and Connor Hawke.

Tribe of desert nomads who have eyes tattooed on the tips of each their finger. Bruce Wayne sought them out to exorcise his demons.

The Mongolian gods.

Bird-like demons in japanese mythology.

Marvel's criminal organization.

They are young henchmen for Ten of the Royal Flush Gang.

An army of robotic servants working for and controlled by Brainiac in order to speed up the shrinking and bottling process of cities. They can emerge from (or invade) any technologically advanced object, plus they are responsible for preserving significant artifacts.

The Terrible Trio are three brilliant criminal inventors who are known as the Fox, the Shark and the Vulture. They use their scientific gadgets to commit extraordinary crimes.

Three career criminals who are enemies of the Fantastic Four .

Led by Condor, Diamondhead, and Powerhouse made the trio.

A mercenary group consisting of fire-haired Karla (leader), Fisherman and the Invisible Un-Thing. They were enemies of Aquaman, Aqualad and Mera.

Terrifictech is a high-tech research company owned by Mr. Terrific.

A trio of scientifics exposed to a unknown radiation which altered his bodies and give them fantastic powers. However this radiation also was affecting their minds.

When brothers Ben and Reed Storm were exposed to cosmic rays, they gained strange fantastic powers, becoming the Terrific Two.

The Terrifying Three were a criminal trio that included Cutlass, the Steel-Jacketed Man and the original Quarrel.

Army of the Grand Overseer who fight the Iridian Rebels

Terror Firma is a terrorist group in the distant future that has come to blows with the Legion of Super-Heroes.

The first Terror Titans are a team created by Clock King to defeat the Teen Titans. A new team of Terror Titans was formed by Haywire, a rejected Teen Titan recruit.

Supervillain twins from Central City.

Terror Unlimited was a group of terrorist that wore armored suits and took several civilians hostage inside the Skyline Restaurant located in the World Trade Center including Mary Jane Watson. Their operation was taken down by Spider-Man and Scarlet Spider.

The Teutonic Knights were a crusading military order established c. 1190.

One Riot, One Ranger

The Thanagarians are highly evolved Hawk people from planet Thanagar. They are known for the discovery of defying gravity with the use of Nth Metal found on their planet.

In the Holy War storyline, Thanos assembled his own team of Defenders to kidnap and dispose of various intergalactic Messiahs.

Creations, clones and cyborgs made by the Mad Titan Thanos to test his opponents abilities

They are a tribal community that live on the planet Barsoom (Mars).

The Tharrians are a colonized race of humans from the 30th century who live in the hottest planet within the United Planets. Because of this all Tharrians can create and manipulate ice and cold. Polar Boy of the Legion of Super-Heroes Is a Tharrian.