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Kaio (界王 Kaiô, literally, King of the Worlds), North Kaio (北の界王 Kita no Kaiô, literally, King of the Worlds of the North), or King Kai in the Funimation dub, is a hero in Dragon Ball Z and Goku's martial arts teacher, and later mentor. He also taught Piccolo, Tenshinhan, Yamcha, and Chaozu. His planet is at the end of a long winding road known as Snake Way, where he teaches powerful, new techniques such as the Genki Dama and Kaio-ken. Despite the fact that his planet is around 100 feet in diameter, its gravity is 10 times greater than Earth's. He has a monkey named Bubbles and a motor-mouth grasshopper named Gregory as pets. He is the Kai from the north of Universe 7. He has a heated rivalry with West Kai.


Saiyan Saga

Kaio first meets Son Goku when Goku journeys to his planet to seek his training. Kaio teaches Goku the Kaio-ken attack, which doubles the users power and a red aura which surrounds them.

Freeza Saga

During the Freeza Saga, Kaio trains Piccolo, Tenshinhan, Chaozu, and Yamcha.

Androids and Cell Saga

No, that's not Krillin's move! That's the last technique Frieza used against Goku! And if Cell thinks he cannot win, he may destroy earth just like Frieza destroyed Planet Namek! That darn, Dr. Gero! How could he unleashed such an evil monster on Planet Earth.
~ King Kai in Cell's Bag of Tricks

Before the Cell Games, Goku teleported to Kaio's place to get a better sensing range so he'd find a new guardian for the Earth. Later, during the Cell games when Cell is fighting Gohan and is caused to revert into his semi-perfect form, Cell decides to take the Earth with him and tries to self destruct. Goku makes a last second decision and teleports him to Kaio's planet where he explodes, destroys the planet and kills Goku, Kaio, Bubbles, and Gregory.


  • Goku
  • Piccolo
  • Tenshinhan
  • Chaozu
  • Yamcha
  • Krillin
  • Olibu
  • Gohan
  • Many other alien warriors



           Dragon Ball transparent logo.png Heroes

Dr. Slump
Arale Norimaki | Senbei Norimaki | Obotchaman | Sankaku Sagata | Akane Kimidori | Aoi Kimidori | Abale | Kurikinton Soramame | Midori Norimaki | Ultraman | Gatchan | Peasuke Soramame | Koita Ojo | Hiyoko | Chivil | Polly Buckets | Old Woman Spring | Turbo Norimaki | Suppaman | Taro Soramame | Tori-bot | Nitro Norimaki | Tsukutsun Tsun | Tsururin Tsun | Tsuruten Tsun

Dragon Ball
Goku | Grandpa Gohan | Bulma | Master Roshi | Oolong | Yamcha | Yajirobe | Dr. Brief | Chiaotzu | Puar | Launch | Mai | Ox-King | Chi-Chi | Krillin | Tenshinhan | Nam | Shenron | Mr. Popo | Karin | Kami | Piccolo Jr. | Sugoro | Android 8

Dragon Ball Z
Z-Fighters | Gohan | King Kai | Vegeta | Dende | Porunga | Future Trunks | Future Gohan | Android 16 | Android 17 | Android 18 | Bulla | Kid Trunks | Goten | Hercule | Videl | Pikkon | Nail | Good Buu | Guru | Pan | Uub | Tarble | Nuova Shenron | Kibito | East Kai | East Kaioshin | South Kai | West Kai | Marron | Panchy | Cynthia | Old Kai

Gogeta | Gotenks | Vegito | Majuub | Kibito Kai | Kefla

Dragon Ball GT
Giru | Goku Jr. | Vegeta Jr. | Beat | Note

Bardock | Beerus | Whis | Jaco | Broly | Cheelai | Lemo

Live-Action Movie
Goku | Bulma | Master Roshi | Chi-Chi | Yamcha | Grandpa Gohan | Shenron

Video Game Exclusive Only
Android 21 | Beat | Note

Dragon Ball Super
Cabba | Hit | Vados | Gowasu | Zeno | Great Priest | Mai | Future Mai | Earth's Resistance | Toppo | Jiren | Caulifla | Kale | Brianne de Chateau | Dyspo | Heles | Belmod | Champa | Sous Roas | Merus | Kusu | Sour | Marcarita |