Rider Time: Kamen Rider Black RX

is a three-episode web television series that serves as the second installment of the Kamen Rider Quartzer Spin-off series while itself being a continuation of and Kamen Rider Red RX.
==Synopsis==
A mysterious person revives Creation King and starts a war against Humans and Kamen Riders. With the appearance of Century King Shadow Moon, Sougo Tokiwa and Geiz Myokoin investigate this event, becoming involved in the war themselves...
==Continuity and Placement==
*Kamen Rider Quartzer: Between episodes 28 and 29, since Sougo and Geiz already know about Kotaro Minami and Gorgom. Additionally, the Black Ridewatch can be seen in episode 29, which aired the same date during the special's release.
*: Since both the events of Kamen Rider Black RX and Kamen Rider Black (manga) are shown as flashbacks, this spin-off technically exists as an alternate continuity. Timeline-wise though, 33 years would have passed since the fall of the Crisis Empire.
==Episodes==
#King Again
#Alternate Brother
#This is Kamen Rider Black RX!
==Characters==
===Kamen Riders===
Kamen Rider Red RX 	Ro Minami
Kamen Rider Black 	Kotaro Minami
Kamen Rider Black RX	Kotaro Minami
Kamen Rider Zi-O 	Sougo Tokiwa
Kamen Rider Geiz 	Geiz Myokoin
===Allies===
===Gorgom Empire===
*Creation King
*High Priest Garom
*Hermit Crab Mutant
*Condor Mutant
*Bison Mutant
*Sea Snake Mutant
*Piranha Mutant
*Buffalo Mutant
*Queen Ant Mutant
*Ant Mutants
===Other===
Century King Shadow Moon	Shadow Moon
==Cast==
===Suit Actors===
==Theme Song==
*Child of the Sun! Kamen Rider Black RX
==Notes==
*This special uses a remixed soundtrack from Kamen Rider Black RX rather than the soundtrack that is used in Kamen Rider Zi-O.
*A reference to the Showa and Heisei Riders Phase 1 is on Sougo Tokiwa's book. When the image is flipped, the text on it says "Masked Rider", the old terminology for Kamen Riders.
**Another reference to an old terminology name for Kamen Riders is seen on Geiz's Biker Jacket, it says Skullman with a Tachibana Racing Club underneath it, the rumored name for Kamen Riders. 
*A reference to Saban's Masked Rider said by Sougo Tokiwa and Geiz Myokoin for not knowing the names for Robo Rider and Bio Rider, calling the forms Super Gold and Super Blue which in returns annoys Kotaro Minami as he then corrects them.