Guyver I is killed by Enzyme and Tetsuro is taken captive by Cronos. Guyot explains to Tetsuro in detail about Cronos' plan to dominate the world through the events of X-Day. Meanwhile, as scientists study the Guyver I Control Medal, Guyver III appears and deals with the scientists and watches Guyver I "regenerate." A regenerated Guyver I causes chaos in the Cronos building, killing everyone and everything in its path, defeating a powered-up Zerbubuth, who is finished off by Lisker.