Kamen Rider: The First

One year prior, two terminally ill hospital patients are given a chance to live by the terrorist organization Shocker, who relocate them to their island base to convert them into the cyborg Inhumanoids, Cobra and Snake.

In the present, Shocker Inhumanoid Bat kidnaps college student Takeshi Hongo to convert and mentally condition him into the Shocker solder "Hopper". While successfully completing a mission, he meets Shocker's Major Agents, who order him to kill witnesses to their operations, journalist Asuka Midorikawa, and her fiancé Katsuhiko Yano. Amidst an attempt on their lives with assistance from Shocker soldier Spider, Hongo's memories resurface and he fights Spider. However, Katsuhiko is killed in the struggle, and Asuka finds Hongo next to his body. Blaming him for Katsuhiko's death, she follows Hongo to figure out why he had changed.

As a result of what happened, Shocker has deemed Hongo a traitor, so Major Agent Dr. Shinigami has Yano's body taken, revived, and converted into a second Hopper to eliminate their former soldier. While Hongo defeats Spider, Yano returns to Asuka and reveals his real name is Hayato Ichimonji instead of killing Hongo, leading to Shocker branding him a traitor as well.

When Bat attempts to kidnap Asuka and turn her into an Inhumanoid, an enraged Ichimonji turns on Shocker and joins forces with Hongo to defeat Bat, Cobra, and Snake at Shocker's base, though Shinigami and the other Major Agents escape to plan their revenge.

The Inhumanoids in Kamen Rider: The First are not non-humans as their name would suggest, but rather cyborgs much like the Kamen Riders. The organization's ranks are depicted as having three commanding characters (seen only on screens), as well as several special-class soldiers and unidentified grunts.

• Shocker Staff: Elderly Gentleman (ショッカー幹部・老紳士, Shokkā Kanbu Rōshinshi): Depicted in the film as the figurehead of Shocker, he is a mysterious elderly man with vampire-like fangs and dons a long black and red cape. During the course of the film, he appears only via satellite on screens in the Shocker headquarters. His physical whereabouts are unknown. He is an adaptation of the original television series' character Doctor Shinigami (死神博士, Shinigami Hakase).
• Shocker Staff: Lady (ショッカー幹部・美女, Shokkā Kanbu Bijo): A female commander in the Shocker ranks, she is responsible for the selecting of new Inhumanoid candidates to be inducted into the organization. Like Dr. Shinigami, "Lady" only appears via satellite on screens in the Shocker headquarters, and her physical whereabouts are unknown.
• Shocker Staff: Youth (ショッカー幹部・若者, Shokkā Kanbu Wakamono): A young male commander in the Shocker ranks, he is responsible for the organization of missions and troop deployment. Like Dr. Shinigami and "Lady", "Youth" only appears via satellite on screens in the Shocker headquarters, and his physical whereabouts are unknown.
• Hopper 1: The brainwashed state of Takeshi Hongo, he is a special-class soldier in the Shocker ranks charged with the carrying out of covert search-and-destroy missions. He later becomes self-aware and defects from Shocker, instead fighting against them as Kamen Rider 1.
• Hopper 2: The brainwashed state of Hayato Ichimonji, he is a special-class soldier in the Shocker ranks charged with hunting and eliminating the traitor, Hopper 1. He later becomes self-aware and begins fighting against Shocker, alongside Hongo, as Kamen Rider 2.
• Spider (スパイダー, Supaidā): A field captain in the Shocker ranks, he is responsible for covert assassination missions, and is behind several "mysterious" deaths prior to and during the course of the film. He is eventually destroyed by Kamen Rider 1's Rider Kick
• Bat (バット, Batto): A field captain in the Shocker ranks, he is responsible for the "recruitment" (abduction) of potential Inhumanoid candidates. He is the only Shocker soldier depicted as being capable of flight. He is ultimately destroyed by Kamen Rider 1 and 2's Double Rider Kick.
• Cobra (コブラ, Kobura): The brainwashed state of Haruhiko Mitamura (三田村 晴彦, Mitamura Haruhiko), he is a special class soldier assigned to Bat's squadron, and later works independently alongside his romantic interest, Snake. He is mortally wounded by Kamen Rider 1's Rider Kick and dies while holding Snake's lifeless body in his arms.
• Snake (スネーク, Sunēku): The brainwashed state of Miyoko Harada (原田 美代子, Harada Miyoko), she is a special class soldier assigned to Bat's squadron, and later works independently alongside her romantic interest, Cobra. She is mortally wounded by Kamen Rider 2's Rider Kick, and dies in Cobra's arms.

Several actors in this film have appeared in previous Kamen Rider productions. Hiroshi Miyauchi plays Tōbei Tachibana, a character who has appeared in numerous other Kamen Rider shows, acting as a sort of father figure to the Riders. Miyauchi is known for portraying the title character in 1973's Kamen Rider V3. Hassei Takano, who portrays Hayato Ichimonji (Kamen Rider 2) in the film, also starred as Miyuki Tezuka (Kamen Rider Raia) in the 2002 series Kamen Rider Ryuki. Hideyo Amamoto posthumously reprises his role as Dr. Shinigami through archival footage from the original Kamen Rider series.

The crew of The First also features many returning faces. Director Takao Nagaishi is a longtime tokusatsu director who has helmed several episodes of 2006s Kamen Rider Kabuto. Nagaishi was also an assistant director on the original Kamen Rider series. The film was written by Toshiki Inoue, a popular fixture in anime and tokusatsu screen writing. He has written virtually every theatrical film in the Kamen Rider franchise, as well as all the episodes of Kamen Rider Agito (except for one) and Kamen Rider 555. He also served as a writer on Kamen Rider Kuuga, Kamen Rider Ryuki, Kamen Rider Blade, and Kamen Rider Hibiki. Inoue is the son of the late Masaru Igami, who was the chief writer on the original Kamen Rider series, as well as Kamen Rider V3, Kamen Rider Stronger, and New Kamen Rider.

• The movie has a great deal of elements from the original television series that spread across from the beginning to end, although several of these conflict with the film's timing. Hongo Takeshi originally had to ride his motorcycle at high speeds to power his typhoon belt and transform into his Rider form while Ichimonji Hayato was able to power the Typhoon by arm movements. Although Hongo was able to do the same eventually, the movie version can do it from the beginning.
• The Riders' henshin movement is also different from the actual series. In the series, Hongo and Ichimonji perform a series of stylish hand-waving, then jump into the air to complete the transformation. In this movie, they simply open up their leather jackets (or polo shirt, in one of Ichimonji's cases), revealing the Typhoon Belt (and their body armor), then snap on their helmets and faceplates on their heads to transform. These movements are implemented later in the movie, but are mostly just showy poses that have no connection to their transformation.
• Dr. Shinigami appears from the very beginning of the movie, although in the original series, he appeared after the defeat of Colonel Zol, the first Shocker general.
• The character of Hayato Ichimonji was completely rewritten. In the television series, Ichimonji was a photographer who was kidnapped to become Shocker's new Kamen Rider, although he was rescued by Takeshi Hongo before he could be brainwashed; the two were allies from the beginning. In the film, Ichimonji was originally Katsuhiko Yano, the lover of Asuka Midorikawa. Katsuhiko was killed by Spider, and Hongo/Hopper was framed for it. Katsuhiko's corpse was recovered and turned into a cyborg similar to Hongo. His brain was altered to believe he was a man named Hayato Ichimonji in competition for Asuka's affection. Ichimonji originally served as Hongo's enemy, and later a hesitant ally. He disappears at the end of the movie, leaving his helmet on the road.
• Asuka Midorikawa shares the same last name as one of Hongo's professors who had worked for Shocker, Professor Midorikawa. In the original series, it is Professor Midorikawa who saves Hongo before he can be subjected to brain surgery by providing the distraction to allow Hongo to escape, only to ultimately be murdered by the Spider. Asuka also shares a similarity with Professor Midorikawa's daughter, Ruriko; both had witnessed the death of their respected loved ones (Professor Midorikawa for Ruriko, who was her father, and Katsuhiko Yano for Asuka, who was her fiancé) with their own eyes and originally thought that Hongo was to blame for it. The both of them ultimately found out the truth and forgave Hongo.

• Masaya Kikawada as Takeshi Hongo (本郷 猛, Hongō Takeshi)
• Hassei Takano as Hayato Ichimonji, Katsuhiko Yano (一文字 隼人, 矢野 克彦, Ichimonji Hayato, Yano Katsuhiko)
• Rena Komine as Asuka Midorikawa (緑川 あすか, Midorikawa Asuka)
• Hiroshi Miyauchi as Tobei Tachibana (立花 藤兵衛, Tachibana Tōbei)
• Eiji Wentz as Haruhiko Mitamura (三田村 晴彦, Mitamura Haruhiko)
• Ryoko Kobayashi as Miyoko Harada (原田 美代子, Harada Miyoko)
• Mayumi Sada as Shocker Staff: Lady (ショッカー幹部・美女, Shokkā Kanbu Bijo)
• Issa Hentona as Shocker Staff: Youth (ショッカー幹部・若者, Shokkā Kanbu Wakamono)
• Hideyo Amamoto as Shocker Staff: Elderly Gentleman (Dr. Shinigami) (ショッカー幹部・老紳士, Shokkā Kanbu Rōshinshi)[1]
  • Eiji Maruyama as the voice of Shocker Staff: Elderly Gentleman (Dr. Shinigami)
• Itsuji Itao as Spider (スパイダー, Supaidā)
• Kanji Tsuda as Bat (バット, Batto)
• Renji Ishibashi as The Member of the House of Representatives (代議士, Daigishi)
• Hirotaro Honda as The Private Secretary (秘書官, Hishokan)
• Hitomi Nakahodo as Megumi (めぐみ, Megumi)
• Katsumi Shiono as Shocker Combatmen (ショッカー戦闘員, Shokkā Sentōin, Voice)

Opening theme

• "Let's Go!! Rider Kick" (レッツゴー！！ライダーキック, Rettsu Gō!! Raidā Kikku)
  • Lyrics: Shotaro Ishinomori
  • Composition & Arrangement: Shunsuke Kikuchi
  • Artist: Koichi Fuji

Ending theme

• "Bright! our Future"
  • Lyrics: ISSA
  • Composition: ISSA & YUKINARI
  • Arrangement: YUKINARI & UNAShinji Tanahashi
  • Artist: Da Pump

The film received a manga adaptation illustrated by Tatsuya Egawa and was serialized in Tokusatsu Ace. However, it became notorious among Kamen Rider fans for its poor quality, which led to Egawa to receive a permanent contract dissolution from Toei after the first chapter was released.

In the 227th episode of the radio show Let's go Manga-chick with Kazuhiko Shimamoto!, Shimamoto, who has done previous works with the Kamen Rider franchise with a Kamen Rider ZO manga and a one-shot manga based on Kamen Rider Black, criticized the author's lack of motivation about the drawings as if were they were preliminary drawings with no background, and the loss of composition. He also criticized the manga's editor for approving the low quality illustrations, quoting, "When I get this manuscript, I'm going to turn my desk over and not take it back".

A sequel was produced in 2007 called Kamen Rider: The Next. The film included the rider Kamen Rider V3, who had his own show in 1973 and served as a sequel to the original Kamen Rider show. The film is also considered by fans to be one of the darkest and most violent Kamen Rider adaptions in the series due to its horror elements.

• Official Kamen Rider: The First website.
• Paul "Igadevil" Sullivan, Kamen Rider: The First review.
• Kamen Rider: The First (anime) at Anime News Network's encyclopedia

• Kamen Rider: The First at IMDb