Deputy Officer of the United Nations Alliance, Simon Marcus, who aims to conquer the world with the terrorist organization Downfall along with the mad scientist Keiji Uraga, attack the Kamen Riders with overwhelming strength. It is only on Kamen Rider Grease that the enemy's abilities did not work. In order to defeat this new enemy and rescue Misora, Kazumi Sawatari must create a new item ... but it is told that it requires the life of his friends, the Three Crows. The ultimate decision must be made.

After the end of the civil war that tore apart Japan, the new governors of Touto, Hokuto and Seito work together to reunify the country. However, they are actually members of an extraterrestrial race called the "Blood Tribe" (the same species as Evolto), who assumed their government positions as part of a plan to destroy Earth as they have done to Mars and other planets before. Considering Sento Kiryū (Kamen Rider Build) a major threat to their plans, the Blood Tribe manipulates his friends and other civilians into attacking him. With even his close ally Ryūga Banjō (Kamen Rider Cross-Z) now against him, Sento must fight to survive and stop the Blood Tribe's plan from succeeding.

Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z is a post-series V-Cinema film of Kamen Rider Build. It will focus on the character of Ryuga Banjo, Kamen Rider Cross-Z, along with Kamen Rider Prime Rogue. It was announced immediately following the broadcast of the final episode of Kamen Rider Build. The film will have a limited theatrical release in Japanese theaters before its home video release. This is the last Kamen Rider movie to be released in the Heisei era.

This premium event featured appearances by the main cast of Kamen Rider Build, who conversed and share stories about the filming of the show that fans were not able to hear elsewhere. The event also included a stage show with an original Kamen Rider Build story created just for the event, complete with lights, sounds, and special effects. The event was be held on Friday, May 4, 2018, and Saturday, May 5, 2018, at the Grand Prince Hotel New Takanawa.

As Kiryu Sento prepares for the proxy battle against Kamen Rider Grease, Nariaki Utsumi appears and offer his help.

Kamen Rider Build: Transformation Lessons ~The Laws Of Transformation Are Set!~ is a web-exclusive series of Kamen Rider Build, which is released on Bandai JP's official YouTube channel, accompanying the airing of the main series' episode.

Kamen Rider Build: Birth! Bear Televi!! VS Kamen Rider Grease! is a Televi-Kun Hyper Battle DVD for Kamen Rider Build featuring the exclusive appearance of Build's Bear Televi Form. This special takes place between episodes 18 and 19. It reveals the origin of the Hokuto Three Crows' dog tags.

Annual Kamen Rider stage show featuring the cast and characters from Kamen Rider Build. This Final Stage & TV Cast Talk Show special event took place after the show’s run, and included In its first half an original stage show story that featured Build, Cross-Z, Grease and more from the TV show, complete with lights, sounds, and special effects. In its second half, there was a talk segment with various cast members from the show. The event was held on October 13-14, 2018 at the Nakano Sun Plaza Hall, in Tokyo.

Kamen Riders Build and Ex-Aid team up with the legendary heroes of the Heisei Generation - OOO, Fourze, Gaim, and Ghost.

Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.

The dark secrets behind Himuro Gentoku's machinations and eventual redemption... Three years ago, Gentoku, head of the Touto Institute of Advanced Matter Physics, tries to convince his old friend and Touto Prime Minister aide Koji Hotei that Touto needs to strengthen their military in order to face the threat Hokuto and Seito represent. After Hotei dismisses him, Gentoku is made aware of a certain researcher.