History Film / KamenRider1

! All spoilers for ''Series/KamenRider'' are unmarked. Administrivia/YouHaveBeenWarned!

* TheMole: [[spoiler:Crabbat betrays Shocker to join Nova Shocker, alerting the latter of the plans to extract the Alexander Eyecon from Mayu.]]

! All spoilers for the 1971 ''Series/KamenRider'' TV series are unmarked. Administrivia/YouHaveBeenWarned!

! All spoilers for the 1971 ''Series/KamenRider'' are unmarked. Administrivia/YouHaveBeenWarned!

After many years fighting Shocker around the world, Hongo returns to Japan to recruit [[Series/KamenRiderGhost Takeru Tenkuji and Makoto Fukami]], Kamen Riders Ghost and Specter, after Shocker's newest incarnation goes after Mayu Tachibana, Tobei Tachibana's daughter, who seems to be connected to their plans to resurrect Ambassador Hell. However, the years have not been kind to Hongo, whose cyborg body is starting to become weaker. There is also a new group known as Nova Shocker, an organization splintered from Shocker and causing an internal power struggle with the Kamen Riders caught in the crossfire.

* CastFullOfWriters: A minor example here - Hiroshi Fujioka helped with rewrites of the movie's script, displeased with how Hongo was portrayed in ''Kamen Rider Taisen''.

* AbsenteeActor: Despite being well after Alain completed his HeelFaceTurn (6-7 episodes after he gets his new outfit), he doesn't show up, nor is he even mentioned.

''Riders will still  be there for you''."

** Not be written by Shoji Yonemura nor feature a previous Heisei Rider since ''Series/KamenRiderDenO Episodes Red and Blue'' in 2010. And with LetsYouAndHimFight being one of his signature tropes for spring movies, suffice to say you won't find that in this movie either; the ''Ghost'' cast and Hongo immediately get on an amicable level.

** Ambassador Hell resurrects and resumes control of Shocker's remnants.

* BigBadEnsemble: Wolga leading Nova Shocker and Ambassador Hell leading Shocker classic are this. [[spoiler:After going completely berserk due to the Alexander Eyecon's power, Wolga becomes the sole BigBad, due to Ambassador Hell forming an EnemyMine with the Riders.]]

* EleventhHourSuperpower: The Rider Damashii from the Youtube ''Kamen Rider Ghost'' shorts return as well as a new Damashii based off of Rider 1.

** Ambassador Hell resurrects and resumes control of Shocker's remnant.

* CastFullOfWriters: A minor example here - Hiroshi Fujioka helped with rewrites of the movie's script, displeased with how Hongo was portrayed in ''Kamen Rider Wars''.

Interestingly, while this will be released at the same time the usual ''Franchise/SuperHeroTaisen'' films were released (two weeks after the newest installment of ''Anime/PrettyCureAllStars''), this film marks the first time that there are no signs of any of the other Kamen Riders from either era, nor is there an appearance from the contemporary ''Franchise/SuperSentai'', ''Series/DoubutsuSentaiZyuohger''.

After many years fighting Shocker around the world, Hongo returns to Japan to recruit [[Series/KamenRiderGhost Takeru Tenkuji and Makoto Fukami]], Kamen Riders Ghost and Specter, after Shocker's newest incarnation goes after Mayu Tachibana, Tobei Tachibana's daughter, who seems to be connected to their plans to resurrect Ambassador Hell. However, the years have not been kind to Hongo, whose cyborg body is starting to become weaker. There is also the other group known as Nova Shocker, an organization splintered from Shocker and causing an internal power struggle with the Kamen Riders caught in the crossfire.

* DemotedToExtra: The ''Ghost'' cast is this. While they're still part of the movie, the focus is more on Hongo and fighting Shocker.

* EvilVsEvil: Shocker vs Nova Shocker, both evil terrorist groups who want to TakeOverTheWorld, but loathe each other.

* {{Archenemy}}: Ambassador Hell clearly sees Hongo as this. [[spoiler:He decidedly doesn't take it well when when Hongo doesn't reciprocate enough to grant his request for a LastDance.]]

* ScrewTheRulesIHaveMoney: What Nova Shocker's true goal is; conquer the world via the global economy.

** Feature a crossover between only two ''Kamen Rider'' series, have a RoleReprisal count that can be counted on only one hand[[note]]Fujioka and Ren Osugi as Ambassador Hell, the latter reprising from ''Series/KamenRiderDecade: All Riders vs. Dai-Shocker'')[[/note]] and not have FakeShemp Riders since ''Den-O Episode Yellow'' (which crossed over with ''Series/KamenRiderDecade'' by featuring only Kaito from that series) in 2010.

* CostumeEvolution: Kamen Rider 1 goes from the lighter and slimmer original design to a bulkier and darker one.

* WalkingTheEarth: What Hongo was doing all this time, fighting Shocker.

* BadassGrandpa: Hongo is ''70'' by this point, his cyborg body is becoming weaker, and yet he still kicks so much ass.