King Kai is known throughout the universe as one of the greatest fighters and martial arts teachers. His house is on a tiny planet at the end of Snake Way. The small planet has ten times the gravity of Earth, and is thus an ideal training site. His companions include a goofy monkey, named Bubbles, and a grasshopper, named Gregory. King Kai possesses a corny sense of humor, as well as great wisdom. Fortunately for our friends, he can communicate telepathically, giving them good advice and warnings in critical situations. King Kai teaches Goku the "Kaio-ken" and how to gather energy from the planet into one great fighting energy ball. Later King Kai takes on the training of Yamcha, Tien, Chiaotzu, and Piccolo using the same techniques that were successful with Goku.