is the theatrical film adaptation of the Kamen Rider Kabuto TV series directed by Hidenori Ishida and written by Shōji Yonemura. Unlike previous Kamen Rider movies, its serves a prologue of sorts to the TV series rather than following its storyline. The movie shows a previous timeline where the close relations between Riders (Kuuga to Hibiki) did not exist and the impact of the first meteor evaporated all of Earth's oceans. Seven years after the meteor hit Earth, ZECT pretends to use a passing comet to refill the Earth's oceans, while in fact they are pulling another meteor to crash on Earth, one large enough to wipeout all of humanity.

Plot

In 1999, an enormous meteor crashed onto Earth and caused a global calamity that depleted the planet's waters. Furthermore, the meteor carried extraterrestrial creatures known as the Worms who proceeded to kill humans and assume their identities. In order to counter this new threat, ZECT was formed, who in turn created the Masked Rider System to combat the Worms. The battles lasts over seven years, depleting Earth's resources and turning it into a barren wasteland. By present time, power struggles in ZECT have caused Hidenori Oda to establish a splinter group called Neo-ZECT with Daisuke Kazama and Shura Hokuto to fight against ZECT's authority. A mysterious youth named Souji Tendou arrives to the city and decides to sell his power to either Neo-ZECT or ZECT for his own personal agenda.