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Gran Zarius: The Crisis Avenger was a bird-like monster which the best soldier Grand Lord Crisis ever made. He worked with Bosgan when summoned by Lord Crisis. While the 10 veteran Kamen Rider team fought the Chaps, Black RX went one-on-one with Bosgan and killed him. Turning his attention to Gran Zarius, Black RX became Bio Rider and destroyed the monster from the inside out. For a time, the 10 veteran Kamen Riders thought that Black RX had been killed, but Bio Rider resurfaced and explained that he bailed out in time before destroying the Spirit World demons.
- Bruticon, his counterpart in Saban's Masked Rider.