Decade, as its title suggests, is the tenth anniversary series of Kamen Rider's Heisei era, and the final installment of its first phase.

Ryota Murai was cast as Yusuke Onodera who is the series' version of Kamen Rider Kuuga.

Rounding up the cast was Kimito Totani who portrayed the thief Daiki Kaito/Kamen Rider Diend.

[4][5] In an interview in the March 2009 issue of Kindai Magazine, Masahiro Inoue stated that Decade was slated as having only 30 episodes.

Cho Kamen Rider Den-O & Decade Neo Generations the Movie: The Onigashima Warship (劇場版 超・仮面ライダー電王&ディケイド NEOジェネレーションズ 鬼ヶ島の戦艦, Gekijōban Chō Kamen Raidā Den'ō Ando Dikeido Neo Jenerēshonzu Onigashima no Senkan) was released on May 1, 2009.

The film takes place between episodes 15 and 16 of Decade and primarily features the cast characters from Kamen Rider Den-O in their new media franchise, the Cho-Den-O Series.

The film Kamen Rider Decade the Movie: All Riders vs. Dai-Shocker (劇場版 仮面ライダーディケイド オールライダー対大ショッカー, Gekijōban Kamen Raidā Dikeido Ōru Raidā Tai Daishokkā) opened in Japanese theaters on August 8, 2009, double-booked with Samurai Sentai Shinkenger the Movie: The Fateful War.

The film provides light to Tsukasa's past and Decade's relation with the mysterious Dai-Shocker organization, whose membership is composed of the various villains and monsters that previous Kamen Riders battled with.

Gackt once again performed the film's theme song, "Stay the Ride Alive" that was released on January 1, 2010.

In a collaboration with popular band SMAP, TV Asahi and Ishimori Productions put forward a special production for SMAP's SmaSTATION talk show titled Kamen Rider G (仮面ライダーG, Kamen Raidā Jī).

Mitsuru Karahashi (also from 555) and Kenji Matsuda (from Hibiki and Kiva) portrayed members of the Shade terrorist cell.

Kazutoshi Yokoyama and Eitoku, two suit actors commonly used by the Kamen Rider production team portrayed security guards in the TV Asahi building.

Voice actor Katsumi Shiono provides vocal effects for the Phylloxera Worm, as he often does for Kamen Rider monsters.

Popular TV Asahi announcer Yoko Ooshita also makes an appearance in Kamen Rider G as herself.

The letter "G" in the title is taken to either meaning "Good", referring to the actor Goro Inagaki, or as an onomatopoeia of the sound of wine being poured out of a bottle (gū gugū (グ〜ググ〜)).

Within the small production, a terrorist organization known as Shade (シェード, Shēdo) takes over the TV Asahi studios in Tokyo.

Goro transforms into Kamen Rider G to take on the Worms, defeating them all save for Phylloxera who is much too strong for him.

As the Phylloxera Worm says in his last breath that the war is not over, Goro reunites with Eri before proclaiming he will protect the world from Shade's evil influence.

The viewer's choices throughout the DVD affect how Decade and Diend's fight against Dai-Shocker's Televi Bae-Kun (てれびバエくん, Terebibaekun) as well as Yusuke Onodera's completion of the Decade Bazooka weapon from a punch out sheet in the back of a Televi-Kun magazine.