|Gorgom Kaijin (Gorgom Mutants)
Gorgom's monsters were based on animals, plants & insects.
|Bat Mutant (Koumori Kaijin)
The Koumori Kaijin was a regularly-used monster in the series. The High Priests would send it out to spy on certain important stuffs or to lure out Kamen Rider Black, instead of engaging in any battle. Its life lasted until episode 49, longer than any of the High Priests. It was finally destroyed in Gorgom's shrine after it retreated from an attack by the Whale monster which had rebelled against Gorgom.
|Spider Mutants (Kumo Kaijin)
There were five spider mutants that attack Kotaro and his stepfather, They were successful in killing the stepfather but they each meet there demise at the hand of Kamen Rider Black.
|Leopard Mutant (Hyo Kaijin)|
|Silkworm Mutant (Kuwago Kaijin)|
|Flea Mutant (Nomi Kaijin)|
|Goat Mutant (Yagi Kaijin)|
|Eagle Mutant (Owashi Kaijin)|
|Rhinoceros Mutant (Sai Kaijin)|
|Cicada Mutant (Semi Kaijin)|
|Bee Mutant (Hachi Kaijin)|
|Lizard Mutant (Tokage Kaijin)|
|Cactus Mutant (Saboten Kaijin)|
|Longhorn Beetle Mutant (Kamikiri Kaijin)|
|Crab Mutant (Kani Kaijin)|
|Mammoth Mutant (Manmosu Kaijin)|
|Rock Turtle Mutant (Iwagame Kaijin)|
|Earwig Mutant (Hasamimushi Kaijin)|
|Tapir Mutant (Baku Kaijin)|
|Black Cat Mutant (Kuroneko Kaijin)|
|Aye-aye Mutant (Onizaru Kaijin)|