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仮面ライダーカブト
故事讲述1999年，一颗陨石突然落在日本涩谷，七年后，神秘外星生命体——蠕虫，以涩谷陨石坠落的涩谷为中心，开始繁殖并变得更加猖獗。由警方组织的秘密组织ZECT开发了 Masked Rider 系统来对抗蠕虫病毒。当加贺美试图借助新开发的新武器“面具驾驶者系统”对抗蠕虫时，一位名叫天道总司的神秘年轻人出现了，他自称“遵循天道并控制一切的人”。由于某种原因，天道总司将 Kabuto Zecter 安装在骑手腰带上，变身为假面骑士 Kabuto。至此，两人陷入了人类与蠕虫的生存之战。
Kagami Arata, a member of ZECT, meets Tendo Soji, who has been training his entire life waiting for the Kabuto Zecter. As a Worm attacks a young girl, Kagami attempts to call the Kabuto Zecter but it flies to the hands of the strange man, Tendo Soji.
Tendo uses the second form of Kabuto, known as "Rider Form" by using a process called "Cast Off". Kagami tries to understand Tendo and why he believes he is destined to be great.
A woman named Yuki is attacked by the Lanpyris Worm and impersonated, but she survives so now there are two Yukis running around. More intrigue between Tendo & Kagami, who is quickly falling out of favor with ZECT, plus a fight between Kabuto and a new kind of Worm at an amusement park.
Kagami must face the tough truth about the person his younger brother really is. Tendo confronts Kagami and tells him that he will defeat all Worms, including Kagami's brother, Bellcricetus Worm. In the end, Kagami is left with the toughest choice of his life.
The connection between Hiyori and Tendo is seemingly discovered as Tendo makes a promise to Hiyori that he might have to break after ZECT discovers the identity of Kabuto.
Tendo plans his escape from ZECT with the help of Kagami. After escaping, Kagami is sent to meet Hiyori, and Tendo must defeat two Worms that are impersonating ZECT members.
So Yaguruma, also known as Kamen Rider TheBee, arrives from ZECT HQ with his own ZECT Trooper team known as Shadow. Kagami warns Tendo to stay out of ZECT affairs now that a new Kamen Rider is here. After saving a wedding and fighting a pair of Worm, TheBee then asks Kabuto about joining them and ZECT, but Kabuto refuses, resulting in a showdown between the Riders.
Due to being upstaged by Tendo, Yaguruma loses his cool and begins trying to defeat Kabuto once and for all. After seemingly destroying the Zect Belt, Hiyori remembers more about her past and the boy she saw with a rider belt.
Yaguruma discovers that Tendo is alive and well, and so is the Rider Belt. Furious, he and Tendo fight once again, but this time, Yaguruma goes insane and injures his fellow comrades in the process. Ideals lost, the TheBee Zecter leaves him for Arata Kagami.
Kagami basks in the power of the TheBee Zecter and the new position of Shadow's captain. However, his mission is to defeat Kabuto and after fighting him, Kagami realizes that there is something far more important to him than being a Rider. After this, he gives up the TheBee Zecter along with the title of Kamen Rider TheBee.
Tendo constantly tells Kagami that he has forgotten something important. Kagami does not understand this, but after being saved from a Worm, Tendo asks him why he joined ZECT. Kagami, still puzzled, watches in shock as Daisuke Kazama, a makeup artist, transforms into Kamen Rider Drake.
Tendo and Daisuke have a contest to see who can get the most girls to follow them in one day. Despite that Tendo did nothing but scratch cards all day, he wins the contest as all the girls collected by Daisuke run to Tendo as they all know who he is. Kagami finally realizes that Tendo was trying to tell him to remember his promise to fight Worms.
Yaguruma returns with a new vigor and is determined to protect Shadow because someone has been killing off Shadow members one by one. Shun Kageyama believes it to be Yaguruma who was the killer, but in the end is proven false. However, Kageyama is chosen to be the new Kamen Rider TheBee.
Kagami is marked as the traitor by Kageyama, and is chased across town by the entire team of Shadow. This seemingly perfect case is broken when Kageyama reveals that he was just using Kagami as bait to lure out the real traitor. A Zect operative shoots Kagami who is saved by tendo at the last second, who reveals that one of Kageyama's troops is actually the traitor, the only one who could see him when he Clocked Up to save Kagami. In the end Drake, TheBee, and Kabuto have a three-way battle.
Kagami feels betrayed by ZECT and takes a leave to try and solve his own mission. Drake and Kabuto secretly back him up and they discover that there are multiple Worms impersonating the same person, and they do not try to kill each other. Tendo joins ZECT in order to find out more about this, and is automatically appointed as Shadow's leader.
Realizing that there were three Worms mimicking the same man all along, Drake and Kabuto work together to defeat them. Kagami's confidence is restored as he thinks that he destroyed a Worm by himself. Masato Mishima temporarily takes over as TheBee as Kageyama failed to do his job.
Gon is hurt as Daisuke constantly ignores her and mistreats her, and so she runs off to Hiyori. However, after being attacked by a Worm, she hits her head and recalls some of her memories. In the end, Gon gets captured by ZECT.
Due to an attack by a Worm from Gon's past, Gon's memories are restored, at the cost of losing her memories of being Gon; and with Daisuke. She returns to her mother and Daisuke leaves for an unknown place, realizing that it was for the best.
A new man by the name of Tsurugi Kamishiro appears, and he is seemingly as arrogant as Tendo. After competing with Tendo in all manners of sports, he meets Tendo at the top of the roof, ready to fight a Worm. It is then shown that he is Kamen Rider Sasword.
Tsurugi becomes the next target of the Phantom Thief Shadow, whose actual goal is to lure the Worm that only targets criminals out. Tsurugi causes a traffic accident which injures Juka, and so Tendo punches him. After realizing Tendo also has a sister, he apologizes. After destroying the Sepultura Worm with a Rider Slash, Sasword transforms into the Scorpio Worm, the very same Worm that killed his sister.
