Best Friend 2121

is the twenty-fourth episode of Kamen Rider Zi-O. It features the debut of Woz Futureing Kikai, and the brief appearances of the GeizRevive Ridewatch and Another Zi-O Watch.
==Synopsis==
In order to access the powers of Kamen Rider Kikai, Sworz uses Heure as a catalyst, forcing him to become Another Kikai! White Woz attempts to strip them of that power so he can grant it to Geiz to make him even more powerful. Meanwhile, Time Jacker Ora has a lot on her mind, as she makes her way to 9 5 DO with some suggestions. Furthermore, Rento is busy rampaging around the year 2121! Sougo decides to work together with the local children to find a way to stop him, but...
==Plot==
==Cast==
*: 
*: 
*: 
* & : 
*: 
*: 
*: 
*: 
*Ziku-Driver, Ridewatch Voices: 
*Ziku-Driver Voice: 
*Beyondriver Voice: 
===Guest Cast===
*: 
*Kikaidriver Voice: 
*: 
*Child: , , , , 
===Suit Actors===
*Kamen Rider Zi-O: 
*Kamen Rider Geiz: 
*Kamen Rider Woz: 
*Kamen Rider Kikai: 
*Another Kikai: 
==Forms and Collectibles Used==
===Ridewatches===
*Watch used:
**Zi-O
***Zi-O Ridewatch II
**Geiz
***Geiz
*Rider Armor(s) used:
**Zi-O
***Zi-O II
**Geiz
***N/A
===Miridewatches===
*Watch used:
**Woz
***Woz, Kikai
*Form(s) used:
**Woz
***Futureing Kikai
==Errors==
*to be added
==Notes==
*As part of Super Hero Time, this episode aired alongside the episode 2, .
*Viewership: 2.9%
*Closing Screen Ridewatches:
**Kamen Rider: Woz
**Miridewatches:
***Woz: Shinobi, Quiz, Kikai
Woz Kikai CS 1.png|Parts of the Kikai Miridewatch appearing by the side of the screen...
Woz Kikai CS 2.png|Then turns to the normal closing screen.
*Count at episode end,
**Watches in Zi-O's possession: Zi-O, Fourze, OOO, OOO Tadajol Combo, Gaim, Kodama, Decade, W, Zi-O II, Phone, Bike, Kuuga
**Watches in Geiz's possession: Geiz, Cross-Z, Ghost, Drive, Faiz, Wizard, Genm, Build, Ex-Aid, Phone, Bike, GeizRevive (Blank)
**Watches in Tsukuyomi's possession: Phone, Taka
**Watches In Woz’s possession: Woz, Shinobi, Quiz, Kikai
**Watches In Swartz's possession: Another Zi-O
*This episode marks the first time Sougo uses Zi-O II's Twice Time Break, as opposed to a King Giri Giri Slash.
*This is the last episode to have an Another Rider to exist with the right year of the original rider had born. Starting from the next episode, all the Another Riders are stated in 2019 instead.
==References==
==External links==
*TV Asahi's official episode guide for ベスト・フレンド2121
*Heisei 20's official episode guide for ベスト・フレンド2121
ru:Лучший друг 2121
Category:New Form Episode