Gynajagram is a tiger-like monster with red and white hair. He can punch, bite and is armed with small black boomerangs. He is under Bosgan’s command to fight Kohtaro. Kohtaro transformed into Kamen Rider Black RX and they fought, with Gynajagram using his boomerangs to attack. RX transformed into RoboRider and shot him. When Gynajagram went to attack RoboRider, he turned into BioRider and attacked in return. When Biorider took out his Bio Blade, Gynajagram also used two boomerangs to fight. When his boomerangs were destroyed by Biorider's Bio Blade, he still attacked with his free hands. Finally, Gynajagram was destroyed by Bio Rider's Bio Blade.