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Pandora Box

The Pandora Box in its display case before the Sky Wall Incident

In the World of Build, the Pandora Box (パンドラボックス Pandora Bokkusu) is an extraterrestrial artifact which was used by Evolto and Blood Tribe to destroy numerous planets across the universe, determined by Vernage to hail from the same planet as Evolto himself. Following its use to destroy the civilization on Mars, it was discovered by a human astronaut during a manned mission from Earth which directly preceeded the Sky Wall Disaster, over ten years prior to the outbreak of the War.

Description and Function

The Pandora Box is comprised of the box itself and six Pandora Panels, which encase the inner box and were ejected when Evolto attempted to open it after first arriving on Earth, leading to the Skywall Disaster. Each panel has ten slots to insert Fullbottles; Fullbottles that have a Best Match being placed directly across from each other, resulting in five Best Matches per panel. Each nation of Japan is represented by two panels of a specific color, with Touto being teal, Hokuto being blue, and Seito being red.

When a panel with all slots occupied by Fullbottles is placed on the inner box, a section of the Pandora Tower is constructed. When all six completed panels are united in this way, the Pandora Tower is completed and the inner box opens to reveal the Evol Trigger.

Later in the series, Sento Kiryu uses one of the teal Touto panels to create the Genius Fullbottle. Shortly afterwards, Evolto places the Evol Trigger in the five remaining panels with all 60 fullbottles, resulting in the creation of the black Lost Pandora Panel in place of the missing Touto panel. Unlike the other panels, the Lost Pandora Panel holds Lost Fullbottles and has the power to defy the laws of physics. When a Lost Fullbottle is taken from a defeated Smash and inserted into the Lost Pandora Panel, it turns black and gold. When Evolto inserts ten of these black Lost Fullbottles into the panels and absorbs it, he is able to assume his Monster Form, granting him warp travel.

When the Hazard Trigger is placed in the five normal panels, a white Last Pandora Panel is created in the same manner as the black version. When both the white and black Last Pandora Panels are united along with the Lost Fullbottles, using the essence of the Genius Fullbottle for the process, two parallel universe versions of the Earth are brought into the same space and a new one is able to be created. During this event, a distortion in space-time is created between the two planets. In order for the process to be successful, Evolto must be present in this space upon its completion. If this does not happen, both versions of the Earth are destroyed. If successful, the two parallel Earths are fused, creating a third that is entirely unique. In this new world, objects and people that only exist in one of the parallel Earths are either erased or allowed to exist unaltered. All other objects and people are fused seamlessly with their parallel counterpart.


Discovery and Activation

Pandora Box on Mars

The Pandora Box, as it was found on the Martian surface.

Pandora Box in storage

The Pandora Box sealed away in a vault.

The alien artifact was found by Soichi Isurugi, who was a crew member of the INSET exploration vessel Prominence during the astronaut's survey of Martian caverns at the time. Upon being touched, it reacted to the human by shedding its stone encasing to reveal its true form, but at the same time, Evolto was released from the box and possessed Soichi. The box was then carried back onto the Prominence and back to Earth. The Pandora Box was believed to have been technology from part of an advanced civilization on Mars.

The Box was not the only foreign object that was brought back from Mars, as the Queen Vernage explained. Her bangle was amongst one of the display objects set to be displayed in a celebratoral return ceremony later on. As Misora Isurugi stumbled upon the items looking for her father Soichi, the astronaut who found the Box, Vernage latched herself onto Misora and removed the essences from Pandora Box, subsequently hindering Evolto's plans, who during the ceremony, dashed forward and tried to activate the box in an attempt to raise Pandora's Tower. However, due to Vernage tampering with the box beforehand, the tower did not rise, and a bright flash of light emanated from the box, generating the Skywall instead, which divided Japan into three sections. On the day known as the Sky Wall Disaster, the box was somehow able to alter the personalities of everyone present at the ceremony, invoking aggressive tendencies into their later developments. As a result, the country itself was torn apart into three districts, each with their own capital and government and pursuing different aims: Hokuto, focusing on social welfare; Seito, focusing on economic recovery; and Touto, focusing on traditional pacifism. The Pandora Box was later kept in a vault in the Touto Institute of Advanced Matter Physics, where it was studied so as to find a possible way to resolve the Skywall crisis.

Present Day

Pandora Box panels tears apart

Sento found a footage of Sky Wall Disaster, displaying to Utsumi and Gentoku.

Sento investigated the Disaster using footage from that day and used a light filter software program to discover that the Pandora Box changed colors and jettisoned two of its green panels upon activation, yet retained its shape. This means that the Pandora Box consists of multiple layers of panels that are interlocked to form its shape, yet somehow can retain its same form and size. Director Himuro confirmed to Sento that the Pandora Box has at least two layers in its structure and the green panels that came loose were stolen three years ago. He suspected that either the government of Seito or Hokuto were involved in the theft and the prime suspect is the astronaut who activated the device.

As it turned out, one of the panels was under the possession of Faust. When Masahiro Nabeshima awoke in the basement lab of nascita, he recognised the compartment in the wall used to check for Best Match combinations of the Full Bottles as being similar to the panel he saw in Faust's headquarters. Sento decided to break apart a section of the wall, only to discover that the other missing panel had been in Soichi Isurugi's possession all this while. As Soichi returned from work, Sento confronted him about the panel. The Testimony Will Be Zero

Soichi eventually revealed that he was the one who activated the Pandora Box, but kept his Evolto facade up, saying he had no idea why he did it.

The Pandora Box also resulted in the creation of the Smash organisms through the Nebula Gas produced from the Skywall.

Transference between parties

Seeing it as an opportunity to incite a war so as to push for Touto's use of the Kamen Rider system for military purposes, Gentoku Himuro/Night Rogue began an operation for Faust to infiltrate the Institute to steal the Pandora Box. Though the operation was slightly deviated due to Blood Stalk's intervention, Night Rogue eventually reclaimed the Pandora Box and kept it in a hidden location, unknown to even Blood Stalk himself. Technology of Destruction

The location turned out to be in a secret basement of one of Namba Heavy Industries' laboratories. Blood Stalk managed to regain possession of the Pandora Box, much to Night Rogue's anger. Blood Stalk, having become Namba's new working partner, kept the Pandora Box in a storage facility belonging to Nanba Heavy Industries. Build managed to overpower Blood Stalk and claim the Pandora Box using his newly attained OctopusLight form, bringing the Box back to nascita, though the Box would end up back in Nanba's possession yet again due to it, along with the Fullbottles, being taken by Soichi, who turned out to be the true identity of Blood Stalk.

It turned out that Soichi had made use of Sento's transformations into Build as well as Misora's power of purifying Fullbottles so as to fulfill his plan of obtaining 10 pairs of Best Matched Fullbottles so as to open up the Pandora Box. Juzaburo Namba, CEO of Namba Heavy Industries, planned to harness the energy source within the Pandora Box to create a weapon more powerful than nuclear arms. However, upon finding out that most of the Fullbottles stolen were nothing more than just fake replicas created by Sento, Soichi decided to confront Sento at the place where they first met each other. Transforming into their respective forms, Build eventually managed to overpower Stalk using his new RabbitTank Sparkling form, created using a component of essence from the Pandora Box. Soichi then decided to leave the Box with Sento once again, saying that he could take it back whenever he wanted to. Theory of Conspiracy Who Takes Off The Veil? The False Kamen Rider

War for the Pandora Box

With the Pandora Box in the possession of Sento's team, Gentoku is alerted to the location of the team and raids Nascita, however he finds nothing as the team has already evacuated to an abandoned warehouse along with the Box. Soichi Isurugi leaks the hideout information as well Sento's true identity as Build and Takumi Katsuragi to Gentoku, and Gentoku leads a raid there. After a battle between Build and Cross-Z with Night Rogue and a couple of Smashes, Taizan Himuro arrives in time to break the battle up and secure the Pandora Box at the Touto Government Office.

Losing the Touto Fullbottles secured at official residences to Hokuto, Gentoku deduced there was a Hokuto spy in Touto and came up with a few contingencies: pretend to store the Pandora Box at the abandoned Namba Heavy Industries Research Institute's basement in an attempt to distract Kazumi Sawatari and the Three Hokuto Crows, and to have Ryuga lead a Touto squadron to Hokuto. Before his plan could come to full fruition, however, Gentoku was overruled by his father Taizan Himuro, whom had made a surprise recovery from his coma. Exiled from Touto, Gentoku revealed himself as Night Rogue and attempted to escape with the Pandora Box only to be intercepted by Build, who recovered the Pandora Box as Gentoku only just got away. The Devil's Trigger

A 1-on-1 Proxy Battle was held between Touto and Hokuto, with both Build and Grease fighting for their country, and the winning country would get to keep the Pandora Box.


Behind the scenes

In Kamen Rider Build, Pandora Box serves as the "MacGuffin" of the series, a plot device often used in many literary narratives.


  • The object's name is a reference to the similarly named Pandora's Box, a dangerous object from a story in Greek Mythology said to contain all the evils of the world. The Pandora of which the box is named after was the first woman created, who was told by the Gods to guard the box but never to open it. However, curiosity got the better of her and she opened it, resulting in entities that embodied pain, death, hate, sickness, sorrow, and so much more to be unleashed upon the world.
    • The lack of the "apostrophe-S" in the name may either be a stylistic choice to make it stand out from the story's version or a mistake stemming from said grammatical construct not being present in Japanese.
    • The evils released from the box are similar to the Smash created from the Box's unknown power.
    • Some variants of the story note that "Hope" remains in the box after all the evils are released. This could be symbolized by Sento, as Build, being the hope of the country against the Smash, and how his power is fueled by the defeated "evils"/Smash through their conversion into Fullbottles.
  • In GoGo Sentai BoukengerIcon-crosswiki, there is also a Pandora's BoxIcon-crosswiki that is coincidentally assigned a different kindIcon-crosswiki of Hazard Level.



  1. 1.0 1.1

Sento Kiryu - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto - Nariaki Utsumi - Shinobu Katsuragi - Kengo Ino - Killbas
Transformation Gear
Fullbottles - Build Driver - Transteam Gun - (Great) Cross-Z Dragon - Sclashjellies - Sclash Driver - Hazard Trigger - Nebulasteam Gun - Cross-Z Magma Knuckle - Evol-Driver - Evol-Trigger - Grease Blizzard Knuckle
Drill Crusher - Hawk Gatlinger - 4Koma Ninpoutou - Kaizoku Hassyar - Fullbottle Buster - Steam Blade - Beat Closer - Twin Breaker - Muscle Glove - Solstall Wings - Giant Scratcher - Space Ride Arm - Spine Knuckle - Long Range Cleaner - Trash Converter - Gold Lio Gauntlet - Multi Deluge Gun
Pandora Box - Halfbodies - Fullbottle Holder - Build Phone
Vortex Finish - Hazard Level - Project Build - Sky Wall - Nebula Gas - Build Annihilation Plan
nascita: Misora Isurugi - Soichi Isurugi - Sawa Takigawa - Kazumi Sawatari - Gentoku Himuro
Prime Ministers: Taizan Himuro (Touto) - Yoshiko Tajimi (Hokuto) - Masakuni Mido (Seito)
Namba Heavy Industries Ltd.: Juzaburo Namba - Nariaki Utsumi - Guardian
Hell Bro's: Fu Washio - Rai Washio
Aliens: Vernage
Gentoku Himuro - Evolto - Nariaki Utsumi - Takumi Katsuragi - Shingo Kuwata - Eita Kawai
Touto: Needle Smash - Strong Smash - Burn Smash - Flying Smash - Mirage Smash - Square Smash - Press Smash - Ice Smash - Stretch Smash
Hokuto: Castle Hard Smash - Stag Hard Smash - Owl Hard Smash
Kaiser: Kaisei Mogami (World of Ex-Aid)
Kengo Ino - Ryoka Saiga - Mitsuomi Gohara - Evolto - Killbas