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.

Kenji Nojimaas Shō Fukamachi / Guyver I (voice)
Nana Mizukias Mizuki Segawa (voice)
Kosuke Takaguchias Tetsurō Segawa (voice)
Katsuyuki Konishias Agito Makishima / Guyver III (voice)
Michiko Neyaas Shizu Onuma / Griselda (voice)
Tetsu Inadaas Aptom (voice)
Takeharu Oonishias Toshiaki Hayami / Bio-Freezer (voice)
Mitsuaki Madonoas Imakarum Mirabilis / Masaki Murakami (voice)
Unsho Ishizukaas Oswald A. Lisker / Guyver II (voice)
Yasunori Matsumotoas Archanfel (voice)