Pre-series
- 1980: Isao Goshikida is born to Yatsude Goshikida. (No. 40-kai!)
- 1993: Isao begins research into parallel worlds as a middle schooler, jumping out of a second story window and injuring himself in the process. (No. 40-kai!)
- 1996: Isao meets Mitsuko, his future wife, in high school, where their shared interests into parallel worlds bring them together. (No. 40-kai!)
- 1999: Isao marries Mitsuko, presumably after graduating high school. (No. 40-kai!)
- December 12, 2000: Kaito Goshikida, Isao and Mitsuko's son, is born. (No. 39-kai!)
- 2011: The Goshikida Professors discover the Parallel Worlds and Super Sentai, producing the Zenkaiger equipment before their disappearance. (No. 1-kai!)
- The Kikaitopia Dynasty Tojitendo begin conquering numerous Parallel Worlds including the 44 Super Sentai worlds, sealing all of them into the Tojiru Gears. (No. 1-kai!)
- During their invasion of Kaizokutopia, they were broken in by the Goldtsuikers, who found their Gear technology and used it to create their own equipment, based on the Gokaigers (No. 9-kai!)
- Flint additionally builds Parallel World gates based on the Tojitendo's stolen technology, allowing the Goldtsuikers to become the first World Plunderers. During their venture on SDtopia, an accident turned their youngest twin brothers into Super-Deformed robots. SDtopia was sealed by the Tojitendo before they could find a cure. (No.10-kai!)
Series2021
- The Goshikidas' world is merged with a portion of Kikaitopia, resulting in the appearance of Kikainoid civilians who interact with humans peacefully. (No. 1-kai!)
- A month later, the Tojitendo start their physical invasion of the Goshikidas' world, the last left to conquer but unable to be sealed. Kaito forms the initial Zenkaiger team with Juran. (No. 1-kai!)
- The next day, Ijirude's experimentation with the Tojiru Gears resulted in the creation of the first Wald, and inadvertently the Great Wald, to assist in the Tojitendo's invasion. Gaon joins the team. The Zenkaigers defeat Kinoko Wald, freeing Kinokotopia. (No. 2-kai!)
- Magine joins the team. The Zenkaigers defeat Koori Wald, freeing Kooritopia. (No. 3-kai!)
- Vroon joins the team. The Zenkaigers defeat Boxing Wald, freeing Boxingtopia. (No. 4-kai!)
- Kaito's missing parents are hinted to have a connection with the Tojitendo. The Zenkaigers defeat Sushi Wald, freeing Sushitopia. (No. 5-kai!)
- Kaito meets the mysterious Stacey. The Zenkaigers defeat Gomi Wald, freeing Gomitopia. (No. 6-kai!)
- Kikai Sentai Zenkaiger the Movie: Red Fight! All Sentai Great Assemble!!
- Kikai Sentai Zenkaiger Spin-Off: Introducing ZenkaiRed!
- Ijirude invents the Geartozinger and Darkness Gears to counter the Zenkaigers. Stacey uses it to become Stacaesar. (No. 7-kai!)
- Stacey sparks a rivalry towards Kaito. The Zenkaigers defeat Door Wald, freeing Doortopia. Zox enters the fray as Twokaizer, seeking the Tojiru Gears. (No. 8-kai!)
- Zox loses a duel to Kaito and promises to not plunder their world during their stay. The Zenkaigers defeat Kashiwa Mochi Wald, freeing Kashiwamochitopia. (No. 9-kai!)
- The Goldtsuikers' motivations in recovering SDtopia for their brothers was revealed, but they are unable to come to a compromise with the Zenkaigers to truly work together. The Zenkaigers defeat Mahiru Wald, freeing Mahirutopia. (No. 10-kai!)
- Flint reveals her guilt for not helping her siblings in SDtopia, Kaito tells her of his parents and the Sentai Gears while encouraging her. Impressed, she copies the Sentai Gears to give Zox a more wider arsenal. The Goldtsuikers defeat Onigokko Wald, freeing Onigokkotopia. (No. 11-kai!)
- The Zenkaigers confront Katatsumuri Wald. Stacey first brings in his own piloted robot, the Battle Caesar Robo, to fight the Zenkaigers. TwokaiOh Cuttaner makes its debut by defeating the Wald, freeing Katatsumuritopia. (No.12-kai!)
- The Zenkaigers learn how little empathy Zox has when he's willing to unhesitatingly sacrifice civilians-turned-Kudacks for his goals, but were still able to make an impression on him when they show him there are other ways to go about it without sacrificing lives, earning his favor. Great Recycle Wald forms his own Sentai, Recycle Sentai Daiwalger, which easily defeats the Zenkaigers, but were mostly wiped out by the newly debuted TwokaiOh Ricky. Great Recycle Wald was instead destroyed by Stacaesar, freeing Recycletopia in the process, who arrives into the fray to offer Zox a deal. (No.13-kai!)
- Stacey offers to let Zox into the Tojitendo Palace for the Tojiru Gear he wants in exchange for Zenkaizer's death, in a duel that Kaito accepts. Despite Twokaizer seemingly winning the duel, Stacey reveals he didn't intend to keep his promise. Everyone had expected this, as it turns out they had been working together to fool him and Kaito reveals himself to still be alive. The team promptly defeats Stacaesar and TwokaiOh destroys the Battle Caesar Robo. Stacey retreats in humiliation. (No.14-kai!)
- Still reeling from his loss, Stacey encounters Yatsude, whose kindness reminds him of his own deceased mother, sparking an interest in her. The Zenkaigers and Goldtsuikers defeat Retro Wald, freeing Retrotopia. (No.15-kai!)
- Stacey meets Yatsude again under the alias of "Satoshi". Blackmailed by Zox with revealing to her his true identity and the fact that he's out to kill her own grandson, Stacey relents and temporarily betrays the Tojitendo, helping the Zenkaigers defeat Jishaku Wald and free Jishakutopia. (No.16-kai!)
- Gege's attempts with the last two Walds put Boccowaus in a much better mood, allowing the Tojitendo to continue with their schemes. Barashitara sends out Toumei Wald, who is defeated by TwokaiOh Ricky, freeing Toumeitopia. Meanwhile Ijirude begins other devious plans of his own, while Stacey is at a loss over where his loyalty lies. (No.17-kai!)
- Stacey visits Colorful again, while the Zenkaigers defeat Renai Wald, freeing Renaitopia. As Yatsude treats him to a free sundae courtesy of Kaito, Stacey ponders why would the latter be so nice to him, just as he comes across a photo of Kaito's parents and hits a realisation. (No.18-kai!)
- Recognising the Goshikida Professors, Stacey finds them being held under a state of stasis in Ijirude's lab. Attempting to ilicit a response from them, he succeeds when he imitates Kaito, causing them to send a command signal for Secchan to produce the Zenkaiju Gear with Flint's help. Zenkaizer uses the new Gear to become Super Zenkaizer, and the Zenkaigers defeat Kabutomushi Wald, freeing Kabutomushitopia. (No.19-kai)
- The Tojitendo discover a new World they missed out on capturing, the Kamen Rider World, and sends out Orihime Wald to conquer it. Zox pursues the Wald and teams up with Kamen Rider Saber and his allies, defeating Orihime Wald and freeing Orihimetopia. Learning the value of the Wonder Ride Books, he steals Ryoga Shindai's Ocean History and returns to the Zenkaiger World, with Ryoga and his sister Reika tagging along in hot pursuit. (Kamen Rider Saber Special Episode)
- The Tojitendo sends out Hikoboshi Wald to kidnap Flint as payback to Zox for ruining their plans, but he ends up capturing Magine and Reika instead. While the Zenkaigers work with Ryoga to lure the Wald out, Flint presents the Rider Gears she made based on the Kamen Riders, which Zox gives to the Zenkaigers for their use, and returns Ocean History to Ryoga. Reika and Magine work together to escape their captivity, and Zox uses a second Zenkaiju Gear to assume his Super Twokaizer form. After Hikoboshi Wald is defeated, freeing Hikoboshitopia, the Goldtsuikers send the Shindai siblings home, while an ominous being awakens back in Saber's World. (No.20-kai!)
- Kamen Rider Saber + Kikai Sentai Zenkaiger: Super Hero Senki
- Super Zenkaizer and Super Twokaizer activate ZenkaijuOh for the first time, defeating Copy Wald and freeing Copytopia. Ijirude presents Stacey with a new weapon. (No. 21-kai!)
- Gaon comes to terms with warming up to the team, sacrificing himself for them to allow Super Zenkaizer and Super Twokaizer to defeat Togyu Wald, freeing Togyutopia. Stacaesar challenges ZenkaijuOh to a duel once more with his newly-obtained Battle Caesar Robo II. (No.22-kai!)
- Kaito hesitates to fight Stacey due to the latter's relationship with Yatsude, but ultimately decides to face him head on, combining with Zenkai Juran to form Super ZenkaiOh Juran, while Zox assists as Super TwokaiOh, destroying the Battle Caesar Robo II. Gege rescues Stacey and requests Ijirude to modify him for his own agenda. Ijirude pulls out Mitsuko's body in stasis to proceed with the plan. (No.23-kai!)
