Tortoise Mutant (15) - A rock turtle monster. It can withdraw into its shell, tackle while in and/or partially in its shell, and bring out the innate hate within humans. Rock Turtle 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 Rock Turtle Mutant's eyes are his weak spot which he successfully aimed for. Once Rock Turtle Mutant was killed by the Rider Kick, its spell on the kids and teachers was lifted.