Fear! Kingdark's Revenge!!

Keisuke accidentally helps Dr. Yan daughter and entrusts her to Tobee. However, the true identity of the girl was the monster Centipede Youkihi. Kamen Rider X raids G.O.D.'s hideout to save Tobee who was taken hostage. Kamen Rider 2 and Kamen Rider V3 also join the battle.