The crossover movie of Kamen Rider Build and Kamen Rider Ex-Aid drops its first trailer featuring the return of other Neo-Heisei riders.

Toei published the video clip in their YouTube channel last Oct. 3. The film, titled "Kamen Rider Heisei Generations FINAL Build and Ex-Aid with Legendary Rider" will be released in Japanese cinemas on Dec. 9.

Kiryu Sento (Kamen Rider Build) is in the center of the trailer's plot. "Kamen Rider Build" is the current series being aired in Japanese TV and in online streaming portals, before it preceded "Kamen Rider Ex-Aid."

The first part of the trailer shows the four doctors-slash-kamen riders getting seriously beaten by an unknown enemy. Hojo Emu (Kamen Rider Ex-Aid) then calls the Bugster virus, Parado. The two are seen doing their iconic bro-fist pre-henshin ritual. Sento transforms into Build and another battle ensues.

The next sequence showed the return of previous riders lead by Ghost, followed by Gaim, then Fourze jumps into action, with OOO ending the flurry of dynamic hero entrances.

More than having to see another crossover movie from the Kamen Riders this Christmas season, fans were more thrilled at the fact that the original actors of previous "Kamen Rider" series are reprising their roles as the title character.

The cast of the movie will include Nishime Shun (Tenkuji Takeru/Kamen Rider Ghost), Sano Gaku (Kazuraba Kouta/Kamen Rider Gaim), Fukushi Souta (Kisaragi Gentarou/Kamen Rider Fourze), and Shu Watanabe (Hino Eiji/Kamen Rider OOO) as well as Miura Ryosuke (Ankh).

Fans are thanking the production team for making another crossover movie. Although last year's movie was a big hit, it only featured the return of Shiraishi Shun'ya (Souma Haruto/Kamen Rider Wizard) and Takeuchi Ryoma (Tomari Shinnosuke/Kamen Rider Drive).

There is no official reveal of the core plot for the winter movie, but fans will be expecting recurring themes like the switch-up transformation between Build and Ex-Aid as well as a movie exclusive All-Rider Form of Build.