Master Splinter is a fictional character from the Teenage Mutant Ninja Turtles franchise. He is depicted as a wise and skilled martial artist who serves as a mentor and father figure to the four turtles: Leonardo, Michelangelo, Donatello, and Raphael. Splinter is often portrayed as a humanoid rat, having gained his intelligence and abilities through exposure to mutagen. In various adaptations, Master Splinter's backstory varies, but he is typically shown as a former human who transformed after coming into contact with the same mutagen that affected the turtles. He teaches them the principles of ninjutsu and emphasizes the importance of honor, teamwork, and responsibility.