->''"I am the child of the sun! [[PunctuatedForEmphasis Kamen Rider! Black! R! X!!]]"''

''Kamen Rider Black RX'' is the ninth TV series in the ''Franchise/KamenRider'' franchise and, unusually for the series, a direct sequel to the previous series, ''Series/KamenRiderBlack''. It was broadcasted from 1988 to 1989 and was the last TV series aired during the Showa-era before the transition to stand-alone movies throughout the 90s.

Six months after being practically left alone at the end of ''Black'', Kotaro Minami has finally gotten on the road to a normal life. He's been adopted by the Sahara family and has a steady job as a helicopter pilot.

However, a new threat to the peace of Earth comes in the form of the Crisis Empire, which seeks Earth as their new invasion target. Acknowledging Kamen Rider Black as a threat, they capture Kotaro while preventing his transformation and attempt to goad him into joining the Empire. Kotaro refuses, and as a result he has his King Stone destroyed and gets thrown off to space.

The sun's radiation, however, resurrected Kotaro's Kingstone and split it into two. Thus, Kamen Rider Black evolved into ''Kamen Rider Black RX''. It also resurrects the destroyed Battle Hopper, upgrading it into Acrobatter. Now, Kotaro must use his new powers to defend Earth from the Crisis Empire, consisting of General Jak, Colonel Maribaron, Naval Commander Bosgan, Captains Gatenzone and Gedorian.

The LighterAndSofter tone of the show clashed horribly with the DarkerAndEdgier ''Series/KamenRiderBlack'', and fans did not approve. However, it's quite wrong to label it a FranchiseKiller, as the series had pretty good ratings (it performed better than ''Series/KidouKeijiJiban'', the ''Franchise/MetalHeroes'' series that aired during the same season, and actually scored a slightly higher series average than ''Black''[[note]]To elaborate, ''Black'' scored a 9.2% series average, while ''Black RX'' scored a 9.3% series average.[[/note]]). It's also notable as the first ''Kamen Rider'' series to introduce the concept of [[NewPowersAsThePlotDemands form changes]], which became a staple of the Heisei era. ''Black RX'' still remains popular amongst the older franchise, and like its predecessor, [[GermansLoveDavidHasselhoff it enjoys massive popularity in the overseas market]].

Oh, and this show also received an "adaptation" by Saban (guys behind ''Franchise/PowerRangers''), called ''Series/MaskedRider''.
!!''Kamen Rider Black RX'' provides examples of the following tropes:

* AsLongAsThereIsEvil: Uttered by Grand Lord Crisis, the BigBad (who maybe the same BigBad of Original ''Series/KamenRider'' through ''Film/KamenRiderZX'') upon his demise.
* BackFromTheDead: Battle Hopper, becoming Acrobatter. Also later, Shadow Moon.
* BadassDriver (Look below)
** CoolCar: RX was one of the first heroes of the Franchise/KamenRider franchise to use a car. It's called Ridron. Later given a tribute by the ''T''ridron of ''Series/KamenRiderDrive''.
* CelebrityParadox: In episode 1, one of the characters actually pick up and read ''[[MindScrew the manga adaptation of]] Series/KamenRiderBlack''
* ChefOfIron: As noted on the ''[[Series/KamenRiderBlack Black]]'' page, star Tetsuo Kurata is a heck of a steak chef (with his own restaurant) and once battled the star of ''Series/KamenRiderBlade'', Takayuki Tsubaki, on a cooking show - and [[CurbStompBattle curb-stomped]] him.
* {{Crossover}}: RX teams up with his [[Series/KamenRiderBlack past self]] (along with Biorider and Roborider) in the short movie ''Sekai ni Kakeru''. He also teams up with all the other past Riders (from [[Series/KamenRider Kamen Rider I]] through [[Film/KamenRiderZX ZX]]) in the final episodes of the series.
* DolledUpInstallment: Sort of. ''RX'' was originally planned as a stand-alone show starring a new protagonist, but Toei decided to keep Tetsuo Kurata for another year due to his popularity and retooled the show at the last minute into a continuation of ''Black''. Outside Shadow Moon's brief guest appearance, ''RX'' barely acknowledges the events of the original ''Black''.
* FinishingMove
** Black RX: Two of them:
*** ''RX Kick''
*** ''Revolcrash''
** Roborider: ''Hard Shot''
** Biorider: ''Spark Cutter''
* GagSub: [[http://tipping40s.com/Videos.aspx?key=251 of the first episode,]] done by The LetsPlay/TippingForties as part of a mod challenge on Website/SomethingAwful.
* GreenLanternRing: Biorider ends up being Kotaro's most versatile form.
* HeelFaceTurn: Shadow Moon, who immediately follows with HeroicSacrifice.
* FakeShemp: [[spoiler:When Kotaro cradles Nobuhiko's dead body after Shadow Moon dies, it's obvious that the producers didn't get a hold of the original actor who played Nobuhiko, as someone else is used for the shot.]]
* ImprobableWeaponUser: Maribaron uses her feather on her helmet as a weapon.
* IntrepidReporter: Reiko.
* LighterAndSofter: For the majority of the series. However...
** DarkerAndEdgier: Near the end of the series, right when all Riders are gathering, [[spoiler:General Jark appeared in his OneWingedAngel form and killed the Sahara parents [[KilledOffForReal and they don't come back to life]].]]
* EqualOpportunityEvil: As bad as Crisis is, they at least do seem to treat their robot minions the same as the living ones.
* InformedAttribute: A great many monsters are described as the "best" of their respective unit, and then quickly meet their doom on the end of the Revolcane.
* MassiveMultiplayerCrossover: By the end of the series, all older Kamen Riders before Black join forces with RX to defeat the Crisis Empire.
* MoodWhiplash: From the intense and dark ''Series/KamenRiderBlack'' to the goofy and light-hearted ''RX''... until near the end when [[spoiler:Jark murders the Sahara parents in cold blood.]]
* MultiformBalance: Black RX was the first Kamen Rider to be a SwissArmyHero, which would become a series staple. His selection of forms was rather simple compared to future Riders: his normal form was [[JackOfAllStats rather balanced, stat-wise]], and he could switch to the [[MightyGlacier stronger-but-slower]] Roborider form or the [[FragileSpeedster faster-but-weaker]] Biorider form.
* NiceJobFixingItVillain: Odds are, Black would've been outclassed by the Crisis Empire, but the villain decided to throw the 'Child of the Sun' into space were he'd be exposed to direct light from the sun, causing him to evolve into the much stronger Black RX.
* NoAccountingForTaste: Shunkichi and Utako Sahara argue ''so much'', you sometimes wonder how did they even manage to have two children.
%%* OldHeroNewPals
%%* ThePowerOfTheSun
* PutOnABus: Kasumi no Joe after some extensive injuries. He comes back after a while.
%%* RedemptionEqualsDeath
* RefrainFromAssuming: The ending theme, "Dareka ga Kimi wo Aishiteru" (Someone Out There Loves You), is sometimes known as "Lonely Heart".
* Retcon: Kotaro brings Rideron to life by using the magic sea cave that brought him to life (never mind how the heck he got it down there). Except it ''wasn't'' the sea cave in ''Black'', it was the elixir that Whale Mutant gave him. The cave was just Whale Mutant's home.
* SameCharacterButDifferent: Minami Kotaro is a lot more spacier and happy-go-lucky since [[Series/KamenRiderBlack last time we saw him]]. Either those six months were really relaxing, or absorbing direct sunlight in space messed with his head.
* SuperpowerLottery: The upgrades Roborider and Biorider
** Really, Black RX as a whole has this. The Kingstone Flash alone is capable of ridiculous feats.
* TakingYouWithMe: [[spoiler:Maribaron attempts to do this in the final episode when she was deadly wounded by Crisis. She failed.]]
* ThemeNaming: A variation, though not by name. Each Crisis general summons monsters based on certain themes. Maribaron uses supernatural monsters, Gatenzone uses mecha monsters, Gedorian uses alien monsters, for example.
* ThereIsNoKillLikeOverkill: Variation. RX was the first Rider to use ''both feet'' for his Rider Kick. Every Rider before him only used one foot in their kicks - including Kotaro himself in his [[Series/KamenRiderBlack previous suit]].
** And note that his RX Kick wasn't ''even the FinishingMove'' - it was mostly used to weaken foes before RX stabs them with the Revolcane.
*** Meaning that, in a series considered LighterAndSofter, they take a double-powered Rider Kick ''and more'' to go down for good. A FridgeBrilliance case of CrouchingMoronHiddenBadass.
* ThrownOutTheAirlock: The Crisis Empire ''tries'' to dispose of Kotaro in this fashion. Fortunately, they didn't realize that the previous villains didn't call him [[ThePowerOfTheSun Black Sun]] for nothing and this merely exposes him directly to the sun, evolving him into Kamen Rider Black RX.
* WeaponOfChoice: RX has a different weapon for each form.
** Black RX: [[LaserBlade Revolcane]]
** Roborider: [[CoolGuns/{{Handguns}} Vortech Shooter]]
** Biorider: [[CoolSword Bio Blade]]