By A Mystery Man Writer
In honor of one of Goku's coolest techniques, here's a look at how he acquired it and how he uses it throughout Dragon Ball Z and Dragon Ball Super.
Kaio-ken Dragon Ball+BreezeWiki
Dragon Ball: All Of Goku's Techniques Ranked From Worst To Best
King Kai - News - IMDb
Dragon Ball Super Cho shingi den SSGSS Son Gokou - Kaio ken Blue Figure & Effect 2 Pack Set : Toys & Games
Dragon Ball: 15 Techniques Goku Has (But He Never Uses)
Super Saiyan Blue Kaioken x10 Goku
Dragon Ball: Goku's 'Stolen' Techniques
Funko Pop! Animation - Dragon Ball Super SSGSS Goku (Kaio-Ken) Glow-in-The-Dark Vinyl Figure - Special Edition Exclusive Multicolor #1256 : Toys & Games
Why didn't any of the human Z-Fighters in Dragon Ball/Z/Super ever learn the Kaio-ken? - Quora