Created from a lab experiment gone wrong, teenage terrapins Leonardo, Michelangelo, Donatello and Raphael live in the sewers beneath the city. These justice-loving, pizza-eating band of brothers cannot help but fight the evil that is Shredder and his gang that terrorize New York.
Leonardo is the leader of the four because of his commanding personality and serious nature. He is ordered and disciplined, and also possesses a strong bond with his father-like mentor, Splinter. Leo wears the blue mask and his weapons of choice are the twin katanas.
Donatello comes across as being the smartest of the brothers especially with all things scientific and “techie. He is an accomplished inventor of the devices that the turtles use for fighting evil and restoring justice. Donnie wears the purple bandana and wields a Bo staff.
Raphael is the sarcastic Ninja Turtle who is also well-known for his quick temper. Raph sports the red headband and prefers two sai in combat.
Michelangelo – nicknamed Mikey by his brothers – is fun and “chilled out” and generally always happy, especially if there is pizza going around! His preferred weapon is a pair of nunchaku, and wears and Mikey will always be seen in an orange mask.
April O'Neil is the Turtle's human ally seemingly a “big sister” to them. April is confident, smart and determined who embarks on many of the Turtle’s adventures and generally helps them by doing the work in public while they fight behind the scenes. Her romantic interest is Casey Jones, also a close friend the four.
Casey Jones Jr. is a hockey-masked vigilante who is never without an array of sporting equipment that he carries in a golf bag. He too has reason to fight the evil forces that lurk in and around the city and has dedicated himself to fighting crime along side the Turtles.
Splinter is the brown rat that was mutated along with the Turtles. He is their sensei and adoptive father who rescued the four from accidentally getting dropped down a storm drain.