Kanzenshuu provides the back history, context, and facts surrounding Goku's supposed usage of Kaiō-Ken X100 in Dragon Ball Z Movie 4 against Slug
Rumor Guide - Goku Uses Kaiō-Ken x100 in DBZ Movie 4
Every Kaioken Multiplier in Dragon Ball EXPLAINED
Does Goku use Kaio-Ken x100 against Slug? : r/dragonball
What do you think would happen if Goku went Kaioken x100? - Quora
Kaio-ken x100, Animated Character Database
Can Goku use Kaioken X100? - Quora
Rumor Guide - Goku Uses Kaiō-Ken x100 in DBZ Movie 4
Rumor Guide - Kanzenshuu
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Can Goku use Kaioken X100? - Quora
Should multipliers in the Dragon Ball series be taken seriously? - Quora
Every Kaioken Multiplier in Dragon Ball EXPLAINED