A powerful Zoalord who is second to Archanfel.
Guyot first makes his presence known in the series after Genzo Makishima is unable to retrieve the 2 missing Guyver Units. After giving Makashima one final chance to retrieve the units he has him re-engineered as the test body Enzyme when he fails. Commander Guyot is present when the Japanese branch of Chronos is destroyed by Guyver I and Guyver III (whose identity is still unknown at this time). Commander Guyot later appears before Agito Makishima at his home and is then attacked by Guyver III (showing his formidable strength for the first time). Guyver III withdraws after the arrival of the Hyper Zoanoid Team Five and the realization that there is more to Guyot than he was aware of.
Commander Guyot goes to Relic Point for the Unit Remover, a device that can remove an active Guyver Unit from its host. He plans to use the remover on one of the Guyvers and bond with the unit, hoping to take control of Chrons from Lord Archanfel.
Guyot has several battles with the Guyvers and Masaki Murakami (fatally injuring the later). When Archanfel appears requesting the unit remover Guyot uses his gravity abilities to create a black hole that sucks the head of Chronos into it. Archanfel returns (in battle form) shortly afterwards, takes the remover and rips Guyot's zoacrystal from his head.
Commander Guyot's fate (in the tv series) is unkown.
In the Bio Booster Armor Guyver OAV series, Guyot is referred to as Commander Rehalt Guou. He is never shown in his battle form and the only power ever displayed is his telepathy.
In the manga series it is revealed that Commder Guyot is alive and has been reprocessed into a test body similar to Murakami (showing how their roles have now been reversed).
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