Kikai Sentai Zenkaiger

Kikai Sentai Zenkaiger (機界戦隊ゼンカイジャー Kikai Sentai Zenkaijā), translated as Machine World Squadron Full Throttle Ranger, is the 45th season of Super Sentai.

The show's theme is robots and machinery, celebrating Super Sentai's 45th anniversary with heroes and items based on past Sentai Robots and Ranger teams.

On March 7, 2021, the series premiered on the Super Hero Time block alongside Kamen Rider Saber after Mashin Sentai Kiramager concluded on February 28, 2021. After Saber's finale, Kamen Rider Revice joined Zenkaiger in the Super Hero Time block and Zenkaiger was replaced by Avataro Sentai DonBrothers on March 6, 2022.

Plot
In this story, our heroes will use full-force full-throttle (全力全開 Zenryoku Zenkai) to stop the enemies who are trying to destroy the parallel universes. One hero known as Zenkaizer, with a heart of justice, will stand up to a preposterous giant mass of evil who has managed to break into their home world. Fighting alongside him are four robotic lifeforms.

Why It Is Full-Force

 * 1) This show does an amazing job of celebrating Sentai's 45th anniversary, by making many references and utilizing a lot of the powers of the previous teams, feeling like an equivalent to Kamen Rider Zi-O and more modern Ultraman shows.
 * 2) A lot of the aesthetics of this show is very well thought out and designed, providing a good use/variety of color. The idea of 4 of the Rangers being based off of iconic Sentai Mechs is really cool.
 * 3) The main cast are all incredibly memorable and charasmatic, each character feeling unique amongst one another and play off one another very well
 * 4) *Kaito Goshikida/Zenkaizer is the hyperactive, but loveable White Ranger, being based off of Akaranger and Big One from Himitsu Sentai Gorenger and J.A.K.Q. Dengekitai.
 * 5) *Juran/Zenkai Zyuran is the Red Ranger, acting as party-loving father-figure of the group, being based off of Shinka Gattai DaiZyuJin from Kyōryū Sentai Zyuranger.
 * 6) *Gaon/Zenkai Gaon is the joyful, animal loving Yellow Ranger, being based off of Hyakujuu Gattai GaoKing from Hyakujuu Sentai Gaoranger.
 * 7) *Magine/Zenkai Magine is the shy, but skillfull Pink Ranger, being based off of Majin Gattai MagiKing from Mahou Sentai Magiranger.
 * 8) *Vroon/Zenkai Vroon is the Blue Ranger acting as neurotic comic-relief, being based off of GoGo Gattai DaiBouken from GoGo Sentai Boukenger.
 * 9) *Zox Goldtsuiker/TwoKaizer is the swaskbuckling 6th/Gold Ranger, being based off of Gokai Red from Kaizoku Sentai Gokaiger.
 * 10) *Stacey/Stacaesar is the mysterious Violet Ranger, being based off of Battle Japan from Battle Fever J.
 * 11) Most of the supporting characters are also very memorable and well-acted, such as Yatsude Goshikida, Secchan, Flint Goldtsuiker, and Cuttaner + Ricky.
 * 12) The Kikaitopia Dynasty Tojitendo are some of the best villains we've had in a while as all of them are very creepy and threatening, especially Stacey and Isao Goshikida/Hakaizer who had gotten a lot of development throughout the series.
 * 13) *The two also played off one another very well as Hakaizer's more flamboyant personality contrasts with Stacey's broodiness, not to mention they both served the same role to Tojitendo, giving them a rivalry later turned alliance.
 * 14) *Not to mention Stacey gave Hakaizer a nice conclusion as he wanted him to reunite with Kaito as Isao was his long lost father.
 * 15) There are a lot of references to past seasons with the aesthetics, such as each of the ranger suits, the super forms/ZenkaijuOh being based off of Dragon Caesar and V-Rex, Cuttaner and Ricky being based off of Samurai Sentai Shinkenger and Chouriki Sentai Ohranger (despite Ohranger not being well-recieved), Battle Caesar Robo being based off of Battle Fever Robo, and Hakaizer looking very similar to Fire Stealth Captor 7 from Ninja Captor
 * 16) The music in this show is fantastic, with the opening being very high energy and a lot of the insert songs sounding similar to scores used in pervious Sentais.
 * 17) To top it all off, it aired alongside Kamen Rider Revice, so far a well received Kamen Rider season.

Bad Qualities

 * 1) It aired alongside most of Kamen Rider Saber, a mixed-to-negative Kamen Rider season.
 * 2) While not having too many flaws, there were some areas in this show that had missed potential.
 * 3) *For a good while it felt like this show was setting up for Kaito and Stacey to be brothers as both of their parents were absent and Yatsude reminded Stacey of his mother. Instead his mother's ghost showed up once in a random episode, though it did develop his story more.
 * 4) *Many fans wanted to see a Green Ranger show up, mainly as the Sixth Ranger since it's a common Sentai color and it would've paid nod to Dragonranger, the first 6th ranger whom was Green.
 * 5) Gaon was REALLY unlikable in the first half as he acted really antagonistic towards kikainoids for no reason, which screwed the team over at times. Zox and Vroon also fall under this category, as Zox has a tendency to act as a Gary Stu, while Vroon's curiosity could just make him a bit obnoxious and outlandish at times.