In this special, Houtaro and Rinne swapped bodies! In order to return to their original bodies, they need to complete missions given to them by Firemars and Inphoenix! But that's not all, both Professor Minato and Supana are acting differently?! The special will also feature the debut of Kamen Rider Gotchard MarsPhoenix!
Is Kamen Rider Gotchard: What's That?! Houtaro and Rinne Switched Places!! on Netflix? Unfortunately the movie Kamen Rider Gotchard: What's That?! Houtaro and Rinne Switched Places!! is not yet available on Netflix. Follow us on Facebook to see when Kamen Rider Gotchard: What's That?! Houtaro and Rinne Switched Places!! becomes available on Netflix!
| Writing | Takahito Oonishi | Writer |
| Directing | Koichiro Hayama | Director |
| Writing | Hiroki Uchida | Script Consultant |
