Time Travel

Time travel is the process of travelling through time which features in many Kamen Rider series.

Time Vent
In World of Ryuki, the card Time Vent allows its user send himself or someone else back in time.

Hyper Zecter
In Kamen Rider Kabuto, Kamen Riders transformed into Hyper Form using Hyper Zecter can move faster than light, therefore can travel into past. Hyper Zecter itself are also capable of travelling through time.

Time Travelling Trains
DenLiner, Zero-Liner, New DenLiner, Ghost Train, GaohLiner, Nega DenLiner, as well as KingLiner can be used to travel through the time stream. The Battleship Onigashima also has this ability.

Imagin Contracts
After fulfilling the contract, the Imagins can open their client's body to go into the past.

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.

Time Ring
Kamen Rider Wizard can use the Time Ring to open a time portal that connect to another point in time.

Other cases

 * In finale of Kamen Rider Kiva, Masao Kurenai (Kamen Rider New Kiva) and Kivat-bat the 4th travel 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 make a time crack, allows Mimihiko go through.
 * The space-time police force in Kamen Rider × Kamen Rider × Kamen Rider The Movie: Cho-Den-O Trilogy Episode Yellow has their own method of time-travelling.
 * Gara's device can manipulate space-time of a targeted area.
 * In Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, a time crack was opened when a meteor landed on Japan, connected 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 briefly opened again by Aqua to distribute Super Core Medals to Kamen Rider OOO.
 * Eel has ability to open a time portal.
 * In Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z, Saburo Kazeta somehow travels back in time to help his future teacher.