What is ninja turtles and master splinter?

Ninja Turtles, also known as Teenage Mutant Ninja Turtles, are four anthropomorphic turtles who were trained in the art of ninjutsu by their master, Splinter. The four turtles, named after Renaissance artists Leonardo, Michelangelo, Donatello, and Raphael, were mutated by exposure to a mutagenic substance and grew to human-like size. They live in the sewers of New York City and work together to fight crime, usually against their archenemy, the Shredder.

Master Splinter is a wise and skilled sensei who trained the turtles in martial arts and in the ways of the ninja. He was once a pet rat owned by a ninja who taught him everything he knew and raised the turtles as his own sons after they were mutated by the same mutagenic substance that transformed him. He is highly intelligent and often provides guidance and advice to the turtles. Splinter is also a skilled fighter and has saved the turtles from danger on multiple occasions.