Pancrase is a mixed martial arts (MMA) organization founded in 1993 in Japan. It combines elements of various martial arts, including wrestling, karate, and Brazilian jiu-jitsu, allowing fighters to use a wide range of techniques. The organization is known for its unique rules, which include limited striking to the head while on the ground. The name "Pancrase" is derived from the ancient Greek sport of Pankration, which was a no-holds-barred combat sport. Over the years, Pancrase has produced many notable fighters, including Bas Rutten and Ken Shamrock, and has played a significant role in the development of modern MMA.