Teenage Mutant Ninja Turtles (2003 TV Series) - Enemies

Enemies

The Shredder remains the main villain for the Turtles throughout most of the series run. He is the leader of the Foot Clan, a secret organization of ninja that seek to take control of the city through criminal activity. The Shredder's empire is functioning at its peak until the arrival of the Turtles. Soon after their arrival and interference, the Turtles become the Shredder's main focus. The Shredder then focuses his efforts on ridding himself of the Turtles using his Foot Ninja to aid him. During the course of the series the Shredder is first revealed to be the killer of Splinter's former master, Hamato Yoshi, and later an Utrom. The Utroms (except for the Shredder, A.K.A. Ch'rell) are a peaceful alien race who crash-landed on earth during the feudal period in Japan. It was then that Ch'rell took on the guise of Oroku Saki, A.K.A. The Shredder.

Baxter Stockman is a technical genius and the scientist responsible for creating the mousers: a series of mouse-like robots that can eat through practically anything. While at first it appears the robots were created in order to help control the cities growing rat problem, it is revealed that Stockman created them as a technical resource for the Shredder. Stockman often does his best to win the favor of the Shredder but frequently fails leading to his general torture and ultimate dismemberment.

Hun is the Shredder's muscle, and leader of the Purple Dragons, an urban street gang that Shredder sometimes utilizes. He constantly seeks the Shredder's approval and leads the Foot into battle against the Turtles. He is revealed to have been responsible for the death of Casey Jones's father years earlier, and as such, is a particular enemy of Casey. Later in the series when it appears that the Shredder is gone for good, Hun returns to leading the Purple Dragons as a separate criminal entity, only to return to the Shredder's side when he returns. Hun hates what he calls "freaks", which are basically any being other than a human, even to point of hating and being ashamed of working for Shredder when he discovers master's true form.

The Triceratons are a warring alien race with the appearance of a humanoid triceratops that the Turtles come into contact with when they are accidentally transported across several galaxies at the end of the first season while attempting to find the missing Master Splinter. The Turtles then become a public enemy of the Triceratons for harboring a fugitive known as the Fugitoid, who possesses a transporting technology that the Triceratons desperately want. The Triceratons wish to use Professor Honeycutt's technology to aid them in their war with a military group called the Federation. Later in the series, the Triceratons invade earth believing that the Fugitoid is still in hiding there when in reality he has gone to live with the Utrom on their homeworld.

The Federation is an alien military organization of human appearance that the Turtles meet when they are in space. The Federation is locked in a war with the Triceratons and both sides seek to gain access to a robot known as the Fugitoid. Professor Honeycutt (the Fugitoid), having created a dimensional portal that would give either side a huge tactical advantage in their current battles, has become the prized object of the war. When the Turtles befriend Professor Honeycutt, the Federation seeks to destroy them for harboring him.

Agent Bishop is a secret government agent tasked with protecting the planet from alien invasion and any other sort of extraterrestrial threat. He first comes into contact with the Turtles during the Triceraton invasion, somewhat later in the series. Although he at first appears to be somewhat of an ally, he in fact wishes to gain access to the Turtles in order to study their mutant D.N.A. Long after the Triceraton threat is over, Bishop continues to hunt the Turtles ultimately becoming one of their main villains for the majority of the fourth season. Bishop allies with Dr. Baxter Stockman and utilizes his technical knowledge in much the same way the Shredder did previously, though their partnership works better as Bishop does not give Baxter "punishments for failure" as Shredder did.