During a battle between a Worm and a group of Zanki (insect-like humanoids who serve as the Worms' underlings), Shotaro's right arm is severely injured. He is saved by a mysterious old man named Tengan Ekoji, who gives him a magical device known as the "Driver" and a "Zapping Ghoul" card.
When activated with the card, the Driver allows Shotaro to transform into Kamen Rider Kabuto, a powerful warrior equipped with various abilities and weapons derived from the form of a beetle (kabuto in Japanese).
"Kamen Rider Kabuto: Episode 1" is the inaugural episode of the 2006 Japanese tokusatsu television series "Kamen Rider Kabuto," which is the seventh installment in the Heisei era of the Kamen Rider franchise. The series was produced by Toei Company, Ltd. and aired from January 15 to September 17, 2006, spanning 49 episodes. The first episode introduces the protagonist, Shotaro Hidari, a 16-year-old high school student who lives on the remote island of Kokubu, located off the coast of Yamaguchi Prefecture. Shotaro's life takes a dramatic turn when he encounters the Worms, monstrous creatures from another dimension known as the "Heavenly Realm" or "Gaea" that have begun invading Earth.