
Kikai Sentai Zenkaiger

 is a Japanese "tokusatsu" television drama, the 45th entry in Toei's long-running Super Sentai series, and the second produced in the Reiwa era. It is the second special anniversary series of the franchise, ten years after "Kaizoku Sentai Gokaiger".
The show succeeded "Mashin Sentai Kiramager", joining "Kamen Rider Saber" in the Super Hero Time line-up on TV Asahi on March 7, 2021. The show's name comes from the titular team's catchphrase, .
Plot.
One month ago, a strange phenomenon suddenly fused the human world with the parallel world of Kikaitopia. Despite this, the inhabitants of both worlds, humans and Kikainoids, quickly got along and live peacefully together.
In the present however, their lives are threatened by Kikaitopia's evil rulers, the Tozitend Dynasty, who seek to conquer all parallel worlds. To face this new threat, a brave and energetic young man named Kaito Goshikida inherits the powers of all previous Super Sentai. Transforming into Zenkaizer, he joins forces with the Kikainoids Juran, Gaon, Magine, and Vroon to protect the multiverse from Tozitend as well as find Kaito's missing parents as the Zenkaigers. 
Production.
The trademark for the series was filed by Toei Company on September 8, 2020.
According to producer Shinichiro Shirakura, the show's diversity in its titular members, featuring a human and four Kikainoids, is due to the Super Sentai series' recurring themes of diversity in its group of protagonists while maintaining strong characters. The reason why Zenkaizer was chosen as the leader despite being colored white is to ensure that he would stand out in future crossovers when grouped alongside other Red Rangers. The four Kikainoids were based on the non-human members of "Uchu Sentai Kyuranger". Although "Zenkaiger" is open to the idea of featuring past heroes in certain episodes, Shirakura mentioned that it will not be done in a similar way to "Kaizoku Sentai Gokaiger".
Films.
"Red Battle! All Sentai Great Assemble!!".
 is a film which serves as the Zenkaigers' official debut and was released in Japanese theaters on February 20, 2021 as part of , alongside "Mashin Sentai Kiramager the Movie: Be-Bop Dream" and "Kishiryu Sentai Ryusoulger Special: Memory of Soulmates". Naoya Makoto, Kei Hosogai, and Jingi Irie reprise their respective roles as Tsuyoshi Kaijo/Akarenger, Basco Ta Jolokia, and Zamigo Delma. Additionally, Nobutoshi Canna and Megumi Han reprise their respective voice roles as Bangray and Kyuemon Izayoi. The events of the film take place between episode 6 of the regular series and the companion web series "Kikai Sentai Zenkaiger Spin-Off: Zenkai Red Great Introduction!".
"Zenkaiger: The Movie".
A film tentatively titled was announced for release in summer 2021, double billed with the film for "Kamen Rider Saber".
Special episodes.
 is a two-episode web-exclusive series released on Telasa on March 21, 2021. Additionally, Satomi Hirose of "Ninja Sentai Kakuranger" makes an appearance. The events of the special take place between "Kikai Sentai Zenkaiger the Movie: Red Battle! All Sentai Great Assemble!!" and episode 7 of the series.