This article is about a/an kaijin in Kamen Rider Black.

Tortoise Mutant (イワガメ怪人 Iwagame Kaijin) (15) is a tortoise Gorgom monster.


Tortoise Mutant was used by Gorgom used in order to help manipulate children into treating people the way that they have treated animals and insects through the "Gorgom Mutant Curriculum" by donating pet turtles to each school. Kamen Rider Black had a hard time beating it in the first battle when it kept withdrawing its head into its shell. During the second battle, he discovered that Tortoise Mutant's eyes are his weak spot which he successfully aimed for. Once Tortoise Mutant was killed by the Rider Kick, its spell on the kids and teachers was lifted.

Tortoise Mutant later appears as one of the Phantom Mutants that assists the Dogfish Mutant.Kamen Rider Black: Terrifying! The Phantom House of Devil Pass


It can withdraw into its shell, tackle while in and/or partially in its shell, and bring out the innate hate within humans.

Video game appearances

Kamen Rider Black: Taiketsu Shadow Moon

The Tortoise Mutant is the twelfth mutant opponent and third boss fought by Kamen Rider Black in the video game Kamen Rider Black: Taiketsu Shadow Moon.