Time Travel

Time Travel is the process of traveling through different points in time. This concept is featured multiple times in the franchise. 
==Confirmed Methods==
:This is a list of methods where there is a physical/tangible object serving as the primary catalyst for temporal travel.
Originating Media 	Method 	Notes
Kamen Rider: Seigi no Keifu 	Evil Eye 	The Evil Eye possesses the power to disrupt the natural flow and merge certain points of time, bringing Kamen Riders of several eras together.
Kamen Rider Ryuki 	Time Vent Card 	The card allows its user to send himself or someone else back in time. This person usually seems incapable of significantly altering the flow of time they encounter as they live back to the present, as Shinji Kido discovers much to his dismay.
Kamen Rider Kabuto 	Hyper Zecter 	The Riders can use the Hyper Zecter to travel faster than the speed of light, essentially enabling time travel. The Zecter itself can also travel through time, allowing it to be used by more than one Rider, as seen in the now non-canon Kamen Rider Kabuto Hyper Battle Video, or to continue being used even after it is destroyed, such as in its debut episode.
Kamen Rider Den-O 	DenLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	ZeroLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	KingLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	GaohLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	Nega DenLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	New DenLiner 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	Ghost Train 	A locomotive capable of penetrating the temporal stream of time can be used to time travel, though destinations are usually only locked to speciifc points where a Rider Ticket points to. However, this can be superceded with the authority of Owner, as seen in Den-O's finale.
Kamen Rider Den-O 	Battleship of Oni 	
Kamen Rider Kiva 	Castle Doran 	Castle Doran can open a Time Door to summon or send any person from or into any moment in the past. Castle Doran itself can enter the time stream.
Kamen Rider Decade 	Aurora Curtain 	Tsukasa Kadoya and Daiki Kaito are capable of time traveling using their Aurora Curtains. Tsukasa would later use this to travel from 2018 to 2015 to aid Another Ghost. He later used this ability to send Sougo Tokiwa to 2068. Daiki later demonstrated this ability by opening up a portal to 2068, where Ohma Zi-O was able to talk to Sougo and Geiz through the portal. Tsukasa demonstrated this ability again by taking Tsukuyomi to 2058.
Kamen Rider Wizard 	Time Ring 	Haruto Soma can use the Time Ring to open a time portal that connects to another point in time.
Kamen Rider Gaim 	Forbidden Fruit 	Mai Takatsukasa, the Woman of the Beginning, used power of the Fruit to go back to the past in an attempt to change the history. However, according to DJ Sagara, whom can also enter the time stream, the structure of time itself is so complicated that not even the nigh-limitless power of the Golden Fruit can properly control traveling through it. As a result, she herself gets lost in multiple parallel timelines. After Kouta Kazuraba became the Man of the Beginning, by eating the fruit, he gained the innate power to travel through time and used it to talk to Sougo Tokiwa in 2013.
Super Hero Taisen GP: Kamen Rider 3D-Video Special: Kamen Rider 4''	History Modifying Machine	Shocker used the machine to send Kamen Rider 3 back in time to 1971. It was later indirectly used by Shinnosuke Tomari to defeat Shocker and Kamen Rider 4.
Kamen Rider Drive 	Time Road 	"Eiji Tomari" used the Time Road to travel from 2035 back to 2015 in order to destroy Krim Steinbelt and bring forth a dystopian future ruled by the Roidmudes.
Kamen Rider Zi-O 	Time Mazine 	The Time Mazines are capable of traveling through time. Two units are in possession of both Geiz Myokoin and Sougo Tokiwa, while Michal Minato possesses an older model.
Kamen Rider: Beyond Generations 	Cyclotron Driver 	The Cyclotron Driver allows the user to send themselves or others through time, though it is only their consciousness that does so and not their physical body. Ryunosuke used the Driver that was created by George in 2071 to consciously travel back to 2021. Afterwards, the team in 2021 use Ryunosuke's Driver to travel to 2071 to help the elderly George against the Devil Rider Corps.
Kamen Rider Gotchard 	Daybreak Timelord 	Daybreak Timelord is capable of time travel and transporting others through time. Houtaro Ichinose is sent to the past by Gotchard Daybreak using Daybreak Timelord.
==Other cases==
:This is a list of methods where there is no known physical catalyst to trigger the temporal travel, or rather the method itself is not entirely clear or known.
*The very first case of time travel and the only one to occur in the Showa era was in Kamen Rider Black, where Golgom's Cobra Mutant possessed a device that allowed him to travel through time. 
*Kohtaro Minami, as Black RX, once traveled to the past to help his pre-RX self. 
*Imagin Contracts: After fulfilling the contracts made with their contract holders, the Imagins can open their host's body to go into the past to the point of their most intense memory. Kai is also capable of opening himself up as a time portal for an Imagin to any point in his own past without need for a contract to be made and fulfilled.
*In finale of Kamen Rider Kiva, Masao Kurenai (future Kamen Rider Kiva) and Kivat-Bat the 4th traveled back in time to the present day (2009) from 2031 to fight alongside their predecessors against the Neo-Fangire, who have also come from 2031.
*In Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship, an earthquake in 1980 causes a time crack, allows Mimihiko to go through.
*The space-time police force in Kamen Rider × Kamen Rider × Kamen Rider: Cho-Den-O Trilogy Episode Yellow has their own method of time-traveling.
*In Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals, Gara used a device empowered by the desire energy collected by the Bells to warp time over three locations as part of his plan.
*In Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, a time crack was opened when a meteor landed in Japan, connecting the present to the point of 40 years in the future. This time crack collapses after Kamen Rider Aqua and future Ankh return to the future, but was briefly opened again by Aqua to distribute Super Core Medals to Kamen Rider OOO.
*Eel has the ability to open a time portal.
*In , Saburo Kazeta somehow travels back in time to help his future teacher.
*In Kamen Rider × Kamen Rider Ghost & Drive: Super Movie Wars Genesis, Ryu Tenkuji in 2005 somehow was able to open a wormhole to the Monolith in the basement of the Daitenku Temple in 2015 to bring his son in the past. When dying, he opened another wormhole to return his son and his friend to the present.
*Woz has the ability to travel through time and meet Zi-O where ever he is, although how he does it is unknown. The Time Jackers also share this ability as well.
*While these timelines technically do not exist, Kento Fukamiya was able to witness and experience several of them pertaining to the fate of the world through Ankokuken Kurayami. 
*Ryunosuke Momose arrived in 2071 from 1971 through a wormhole in space. 
*In Kamen Rider Geats, the Desire Grand Prix staff, sponsors, and audience originate in the distant future. The entire tournament is an entertainment-based reality show that takes place in various time periods across history.
==Alternate timelines==
Timeline 	Negated By 	Featured in
Kohtaro Minami attempted to stops Nobuhiko Akizuki from going to their 19th birthday. 	Cobra Mutant stopped Kohtaro and restored the history. 	The Dangerous Time Thief
Crisis Empire revert Kohtaro Minami back to when he was Kamen Rider Black, attempting to kill him when he was weaker than Black RX. 	Kohtaro himself repeatedly travels back in time and saves his past self. 	Kamen Rider: Run All Over the World
In the World of Ryuki, Reiko Momoi is murdered by Kamata, the Paradoxa Undead. 	Shinji Tatsumi, using the Time Vent. 	Kamen Rider Decade Battle Trial: Ryuki World
Hitching a ride on the DenLiner as it tracks a New Mole Imagin to November 11th in 1971, the Greeed Ankh accidentally leaves behind a Cell Medal which is recovered by Shocker, who combines it with the Core Medal they crafted to create the Shocker Greeed, the ultimate warrior who defeats the Double Riders, allowing Shocker to seize control of the Earth while allying with numerous villainous factions, seemingly erasing the Kamen Rider legacy.	Reversed in parts but not entirely negated as numerous Kamen Riders, restored by the people's memories, ultimately return to defeat Shocker and the Rock Great Leader himself on April 1st, 2011. (see OOO, Den-O, All Riders: Let's Go Kamen Riders#Continuity and Placement)	OOO, Den-O, All Riders: Let's Go Kamen Riders
Ryoma Sengoku discovers Kohgane, a malicious lifeform derived from the Forbidden Fruit, who kills him. Following this, Lapis creates the Soccer World. 	11 Armored Riders by defeating Kohgane, allowing Lapis to rest. 	Kamen Rider Gaim: Great Soccer Battle! Golden Fruits Cup!
Using the History Modifying Machine to send Kamen Rider 3 to eliminate the Double Riders on February 10th, 1973, Shocker proceeds to take over the Earth while brainwashing the future Kamen Riders to serve their cause. 	, piloted by Kamen Rider Drive and five , formed by . 	Super Hero Taisen GP: Kamen Rider 3
1st loop: Go Shijima is killed by Cheetahkatatsumuri.2nd loop: Shinnosuke Tomari fails to save Go's life.3rd loop: Shinnosuke sacrifies his own life to save Go from Arimammoth.4th loop: As Deadheat Mach, Go is killed by Cheetahkatatsumuri.5th loop: Shinnosuke is killed by Kamen Rider 4.6th loop: Kiriko Shijima commits suicide in an attempt to stop the loops. 	History Modifying Machine 	D-Video Special: Kamen Rider 4
Final loop: Shocker assembles its forces. 	Takumi Inui, by destroying the Great Leader of Shocker's Axel Watch. 	D-Video Special: Kamen Rider 4 Duel! The True Identity of Shocker's Great Leader
By the year 2035, Earth is dominated by the Future Roidmudes. 	Kamen Rider Drive by destroying the Paradox Roidmude, whom had travelled from 2035 to fuse with his past self on August 8th, 2015. 	Kamen Rider Drive: Surprise Future
The events of Super Movie Wars Genesis. 	 	Kamen Rider Ghost: ~Memories of the Future~
World of Build 	By combining his world with the prime reality, Sento Kiryu creates a new world where Evolto does not exist. 	Kamen Rider Build
Time Jacker/Zi-O Timeline Alteration - Build:With the creation of Another Build, its existence causes a power disturbance, stripping both Build and Cross-Z of their Rider powers and altering the timeline itself. After Zi-O used Build's powers to destroy Another Build, the timeline remained altered. 	Temporary defeat of Another Build by means of not using the Build Ridewatch (temporary) 	Kamen Rider Zi-O episodes 1 and 2
Time Jacker/Zi-O Timeline Alteration - Ex-Aid:With the creation of Another Ex-Aid, its existence causes a power disturbance, stripping Ex-Aid, Brave, and Genm of their Rider powers and altering the timeline itself. After Zi-O used Ex-Aid's powers to destroy Another Ex-Aid, the timeline remained altered. 	Temporary defeat of Another Ex-Aid by means of not using the Ex-Aid Ridewatch (temporary) 	Kamen Rider Zi-O episodes 3 and 4.
Time Jacker/Zi-O Timeline Alteration - Fourze:With the creation of Another Fourze to prolong his usage of Another Faiz's powers, its existence causes a power disturbance, stripping Fourze and Meteor of their Rider powers and altering the timeline itself. After Zi-O used Fourze's powers to destroy Another Fourze, the timeline remained altered. 	Temporary defeat of Another Fourze by means of not using the Fourze Ridewatch (temporary) 	Kamen Rider Zi-O episodes 5 and 6.
Time Jacker/Zi-O Timeline Alternation - Faiz:With the creation of Another Faiz, its existence causes a power disturbance, stripping Faiz and Kaixa of their Rider powers and altering the timeline itself. After Geiz used Faiz's powers to destroy Another Faiz, the timeline remained altered. 	Temporary defeat of Another Faiz by means of not using the Faiz Ridewatch (temporary) 	Kamen Rider Zi-O episodes 5 and 6.
Time Jacker/Zi-O Timeline Alteration - Wizard:With the creation of Another Wizard, its existence causes a power disturbance, stripping Wizard and Beast of their Rider powers and altering the timeline itself. After Geiz used Wizard's powers to destroy Another Wizard, the timeline remained altered. 	Temporary defeat of Another Wizard by means of not using the Wizard Ridewatch (temporary) 	Kamen Rider Zi-O episodes 7 and 8.
Time Jacker/Zi-O Timeline Alteration - OOO:With the creation of Another OOO, its existence caused a power disturbance, stripping Eiji from his Rider powers and altering the timeline itself. After Zi-O used OOO's powers to destroy Another OOO, the timeline remained altered. 	Temporary defeat of Another OOO by means of not using the OOO Ridewatch (temporary) 	Kamen Rider Zi-O episodes 9 and 10.
Time Jacker/Zi-O Timeline Alteration - GaimWith the creation of Another Gaim, its existence caused a power disturbance, stripping a pre-God version of Kouta from his Rider powers and creating a new and separate version of himself as opposed to his simultaneously existing god-self. After Zi-O used Gaim's powers to destroy Another Gaim, the timeline remained altered. 	Temporary defeat of Another Gaim by means of not using the Gaim Ridewatch (temporary) 	Kamen Rider Zi-O episodes 11 and 12.
Time Jacker/Zi-O Timeline Alteration - GhostWith the creation of Another Ghost. its existence caused a power disturbance, stripping Takeru Tenkuji of his Rider powers and altering the timeline itself. After Zi-O used Decade's powers augmented with Ghost to destroy Another Ghost, the timeline remained altered. 	Prevent Makimura from becoming Another Ghost (negated).Temporary defeat of Another Ghost by means of not using the Ghost Ridewatch (temporary) 	Kamen Rider Zi-O episodes 13 and 14.
In a vain attempt to defeat Another Ryuga, Geiz loses both his Ridewatch and his life. 	Sougo, by using the power of Zi-O II, rewinds time before defeating Another Ryuga. 	Zi-O Strongest! 2019
Oma's DayOhma Zi-O does not exist in the year 2068. 	Sougo Tokiwa decides to rewrite time rather than ruling it. 	2019: Apocalypse
Touma Kamiyama dies and Master Logos destroys the world. (Multiple versions exist within the world of Ankokuken Kurayami) 	Touma creates Haouken Xross Saber and defeats Solomon. 	Kamen Rider Saber
Devil City 2071By the year 2071, the devil Diablo conquered the world. 	George Karizaki created the Cyclotron Driver and sent Ryunosuke Momose back in time to 2021 as Kamen Rider Century to defeat Diablo. 	Kamen Rider: Beyond Generations
In 2023-2024, Glion succeeded in destroying the world, causing a dire future where Houtaro Ichinose was the only survivor amongst his friends. 	Future Houtaro went back in time to save his younger self, allowing his younger self to unlock Fire Gotchard early and change the future. 	Kamen Rider Gotchard.
==Notes==
*The concept of time travel itself as a science is often discussed analogous with Einstein's theory of relatively, meaning that the closer a person or object reaches the speed of light, it increases their likelihood of traveling through time. In terms of fiction, time travel is a common concept used in many forms of popular culture.
==External links==
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