A mysterious alchemist studies and experiments to create a "living creature" called a Chemy. Unfortunately, the cards that should have been well-kept accidentally slipped together. A high school student named Houtarou Ichinose accidentally got involved and was given a task to return all the Chemies that were released around the world. He transformed with the Grasshopper Chemy, Hopper 1, and the Steam Locomotive Chemy, Steamliner to become Kamen Rider Gotchard.

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.

Houtaro is suddenly transported to a parallel world. Awaiting him is a young man named Houou Kaguya Quartz who summoned him using that world's technology, the Aurora Curtain System. His favorite phrase is "Gorgeous" and he protects the world from the clutches of the evil organization called "Hundred". What's more, the person following Kaguya is a butler named Butler, who looks exactly like Houtaro's friend Ryo Kajiki!

Houtaro and friends are suddenly attacked by Geryon. As they struggle against enemies that appear one after another from a space-time gate, they discover that enemies have been sent from the future! To protect the present and the future, Houtaro and Rinne travel through time and space to the devastated future. Thus the final battle, with everything on the line, finally begins!

The extended version of the Romeo & Juliet play performance as seen in Kamen Rider Gotchard's 31st episode, and presented like it was shot in-universe.

In this Blu-ray exclusive spin-off, the main cast of Kamen Rider Gotchard are now students of Gotchard High School with Atropos as their new homeroom teacher?!

Hotaro has forgotten how he should pose when transforming! Can Kudoh help him remember?

In this special, Houtaro and Rinne swapped bodies! In order to return to their original bodies, they need to a complete mission given to them by Firemars and Inphoenix! To help them, both Professor Minato and Supana are acting differently?! The special will also feature the debut of Kamen Rider Gotchard MarsPhoenix!

The Abyssal Sisters who plague Kamen Rider Gotchard discuss some side plans to their normal evil schemes...