Transformation Summon

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Transformation Summon

Transformation Summon



Japanese (ruby)


Japanese (base text)


Japanese (romanized)

Henshin Shōkan


Transformation Summon

A Transformation Summon (へんしんしょうかん Henshin Shōkan) is when a Fusion Monster is Special Summoned using the effect of a specific card, and without using any Fusion Materials (the Special Summon is not treated as a Fusion Summon). This type of Summon is featured in the Yu-Gi-Oh! GX manga with the "Masked HERO" archetype.

It essentially reduces the amount of cards used for a Fusion Monster by one, in that only one monster and a card such as "Mask Change" or "Form Change" is needed, as opposed to two or more monsters and "Polymerization".[1] However, the produced Fusion Monster tends to be less powerful than one Special Summoned by means of a regular Fusion Summon.


  • The TCG/OCG effect of "The Eye of Timaeus" resembles the mechanics of Transformation Summon, but it actually performs a Fusion Summon, using one Fusion Material.
  • The Japanese name for Transformation Summon (Henshin Shōkan) is a reference to the Kamen Rider franchise, whom the Masked HERO are based on. In this series, most of the Riders shout "Henshin" before transforming.


  1. Yu-Gi-Oh! GX Chapter 05151: "Masked Hero vs. Vision Hero!!"