Guiron is a fictional kaiju from the Gamera series, first appearing in the 1969 film "Gamera vs. Guiron." It is a blade-headed alien monster created and controlled by the extraterrestrial S-Krone aliens. Guiron serves as one of Gamera’s major adversaries in the Showa-era films, acting as a deadly guardian and executioner on the aliens’ planet. The creature is known for its razor-sharp head blade, lethal throwing knife-style attacks, and brutal combat style.