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''Kamen Rider J'' was a 1994 movie installment in the long-running Franchise/KamenRider series.

Kouji Segawa is a reporter whose little friend, Kana, is carried off by the monstrous children of the alien Fog Mother to feed to her newly-hatched offspring. Kouji is given the mystical "J Power" to become Kamen Rider J and defeat Fog Mother before she can destroy mankind.

Footage from the movie was used in several episodes of Saban's ''Series/MaskedRider'' (one of which ''was'' the giant fight with the Fog Mother), with J appearing only in faraway shots to hide how little he looked like Series/KamenRiderBlackRX.

J would appear in several later ''[[Franchise/KamenRider Kamen Rider]]'' movies, with the cameos being more minor as the years go on.
* ''Film/KamenRiderWorld'' (1994) - UsefulNotes/ThreeDMovie {{crossover}} with ''Film/KamenRiderZO''
* ''[[Film/KamenRiderDecadeAllRidersVsDaiShocker Kamen Rider Decade: All Riders vs. Dai-Shocker]]'' (2009)
* ''[[Film/KamenRiderKamenRiderWAndDecadeMovieWar2010 Kamen Rider Decade: The Last Story]]'' (2009)
* ''[[Film/OOODenOAllRidersLetsGoKamenRiders OOO, Den-O, All Riders: Let's Go Kamen Riders]]'' (2011)
* ''[[Film/KamenRiderXSuperSentaiSuperHeroTaisen Kamen Rider × Super Sentai: Super Hero Taisen]]'' (2012)
* ''Film/HeiseiRiderVsShowaRiderKamenRiderWarsFeaturingSuperSentai'' (2014)
* ''Film/SuperHeroTaisenGPKamenRider3'' (2015)
* ''Film/KamenRiderSaberPlusKikaiSentaiZenkaigerSuperHeroSenki'' (2021)

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!!''Kamen Rider J'' provides examples of:

* BadassBiker: Duh!
* BehemothBattle: The FinalBattle of the movie is J in his gigantic Jumbo Formation vs the equally gigantic Fog Mother.
* CoolBike: Kouji has the J-Crosser.
* {{Crossover}}: With ''Film/KamenRiderZO'' in the 8-minute short ''Kamen Rider World''. Guest-starring monsters from several Franchise/KamenRider installments and [[spoiler: [[Series/KamenRiderBlack Shadow Moon]]]].
* EldritchAbomination: The Fog Mother is a giantic cybernetic doomsday monster whose sole purpose for existing is to feed civilizations to her monster offspring. And that's even mentioning her true form.
* {{Flanderization}}: In later appearances J's ability to grow is the only thing about him that factors in at all.
* GoodHurtsEvil: The Fog Mother feels intense pain when J is first given his powers.
* GreenAesop: It appears here and there, though the Fog Mother's plan doesn't revolve around it.
* LighterAndSofter: At least when compared to ''ZO''. While it's definitely not without its creepy moments, considering the villain is a giant EldritchAbomination, it still has a more fantastical and light-hearted storyline than its predecessor, as well as a much more optimistic ending.
* MakeMyMonsterGrow / SuperMode: A heroic example where J does this to himself to defeat the giant Fog Mother.
* MamaBear: Fog Mother is actually quite ticked off when J kills her babies and tries to take him down with her as she's dying because of it.
* MightyGlacier: J in Jumbo Formation. He trades off his speed for increased strength, as described with the entry for SquareCubeLaw below.
* NatureSpirit: A group of weird plant people who bring Kouji back to life as Kamen Rider J and task him with destroying the Fog Mother and her evil spawn, they state they're spirits of the Earth.
* {{Novelization}}: Written by veteran tokusatsu screenplay writer Shozo Uehara and Shotaro Ishinomori, the novel expands the story of the film and explains various details that the film omitted due to its short runtime such as the origin of the Earth Spirits.
* PhlebotinumKilledTheDinosaurs: The Fog Mother in this case.
* ShoutOut: Kamen Rider J's name is a reference to the Japanese Pro Soccer League, better known as "J-League", which was founded a couple of years before the movie premiered.
* SquareCubeLaw: In an interesting example of this law being acknowledged, when J assumes his Jumbo Formation, not only does he become stronger, but he also moves much slower than before, being seemingly unable to move faster than walking pace. Plus, the ground can visibly be seen cracking and collapsing under his weight. Essentially, he becomes a MightyGlacier with all the extra weight that comes with it.
* TakingYouWithMe: After being mortally wounded by J, Fog Mother tries to take J with her.
* TechnicolorDeath: Oddly averted for the first three monsters, who simply die... but more than made up for with Fog Mother who goes out in multiple giant explosions.
* TerribleTrio: Fog Mother's three children: Agito, Zuu and Garai.
* TouchOfTheMonster: Kana passes out the instant she's carried off by Zuu, and spends nearly the entire film unconscious.
* TheWorfEffect: [[spoiler:Several later appearances of J have him in giant form all the time - only to lose to something even more powerful. In ''Kamen Rider Taisen'' he's downed in the ColdOpen!]]
* WouldHurtAChild: Kana is captured as part of a ritual the Fog Mother intends to carry out.
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