The World Martial Arts Tournament known as Tenka'ichi Budōkai (天下一武道会, literally Strongest Under the Heavens; Martial Arts Tournament) refers to an event in the manga of Dragon Ball, and in the anime of Dragon Ball/Z/GT. In all the Dragon Ball series there is a Tenka'ichi Budōkai on Earth, occurring every 5 years (which later changes to every 3 years). The tournament features Earth's strongest fighters as well as the regular participation of the Z Fighters. All Budokai's in the original Dragon Ball series follow a certain pattern: