O agente do FBI Max Reed testemunha o assassinato do Dr. Tetsu Segawa - um investigador da misteriosa Chronos Corporation. O Dr. Segawa roubou um dispositivo alienígena conhecido como "The Guyver" a Chronos. O estudante universitário Sean Barker, cujo pai da namorada era o Dr. Segawa, encontra o esconderijo do Guyver enquanto observa a equipa forense a investigar o local do crime.
Sean Barker tornou-se o anfitrião relutante de uma bio-armadura alienígena conhecida como Guyver. Há um ano destruiu a Kronos Corporation, uma organização de mutantes que querem o Guyver. Agora está a tentar descobrir por que razão a unidade Guyver o obriga a lutar e a matar o mal.
Guyver: The Bioboosted Armor is a Japanese anime series based on the long-running manga series, Bio Booster Armor Guyver, written by Yoshiki Takaya, adapting chapters 1 - 59 of the manga. The production was in association with ADV Films and Kadokawa Shoten. The series first episode aired in Japan on August 6, 2005 and the last episode aired on February 18, 2006. The series aired in North America on December 20, 2010, on the FUNimation Channel.
The Guyver: Bio-Booster Armor is a 12 part anime OVA loosely based on Yoshiki Takaya's manga, Bio-Booster Armor Guyver. It was released in Japan from 1989 to 1992. It is the second animated adaptation, following the 1986 OVA Guyver: Out of Control.
