When all hell's breaking loose, you'll be right in the eye of the storm.
Gokai Red: Each and every Rider... I will defeat! Kamen Rider Decade: In that case, each and every Sentai... I will defeat.
Kamen Rider × Super Sentai: Super Hero Taisen is a film (released April 21, 2012) that pits Toei's two most prominent Toku franchises against one another in a giant Cross Over battle. Captain Marvelous, AKA Gokai Red, has formed Dai-Zangyack and attacks the Kamen Rider universe, hoping to claim their Grand Powers and the Ultimate Treasure in the Universe, mainly assisted by the freshly renamed Rider Hunter Silva. Opposing them is Dai-Shocker, reformed by Doctor G and again led by Tsukasa Kadoya AKA Kamen Rider Decade AKA Great Leader. Meanwhile, Rangers and Riders on both sides of the conflict are left wondering what's going on and why they're even fighting to begin with.Oh, and it features nearly 300 Rangers, Riders and villains fighting alongside one another.
Kamen Rider Decade: Tsukasa Kadoya/Decade (Masahiro Inoue), Daiki Kaitou/Diend (Kimito Totani), Narutaki (Tatsuhito Okuda)
Kaizoku Sentai Gokaiger: Captain Marvelous/Gokai Red (Ryota Ozawa), Joe Gibken/Gokai Blue (Yuki Yamada), Luka Millfy/Gokai Yellow (Mao Ichimichi), Don Dogoier/Gokai Green (Kazuki Shimizu), Ahim de Famille/Gokai Pink (Yui Koike), Gai Ikari/Gokai Silver (Junya Ikeda)
Kamen Rider Fourze: Gentaro Kisaragi/Fourze (Souta Fukushi), Ryusei Sakuta/Meteor (Ryo Yoshizawa), the Kamen Rider Club
Awesome, yet Impractical: Don't misunderstand, having 200+ stunt actors to get in the suits and have at least one screen appearance is an amazing fest. However, action scenes can't include all of them fighting at once and admittedly it takes a lot of money to do this in the first place so they probably couldn't do it even if they had the time.
Back from the Dead: A shed load of villains from both Kamen Rider and Super Sentai, as this movie features the return of Dai-Shocker and the introduction of Dai-Zangyack. Though admittedly Dai-Zangyack's range of villains is far less diverse than Dai-Shocker, while the latter has many villains from both the Showa and Heisei eras, Dai-Zangyack mostly has villains from the past few years and only two Showa villains, though it helps that one of them (Rider (nee Bio) Hunter Silva) becomes the top dog of Dai-Zangyack. Literally every single villain in this movie, whether they are from Dai-Shocker or Dai-Zangyack, has been brought back from the dead (with the exception of Dai-Shocker's Doktor G, since he's actually Narutaki in disguise; also not counted is Kamen Rider Diend, who is just an Anti-Hero who decided to be a dick at the end)
An interesting case occurs when Joe and Don with Daiki and Hina travel via the DenLiner to 1976, the days of Himitsu Sentai Goranger, where they encounter Baseball Mask, the Monster of the Week of Gorenger #53, witnessing his destruction at the hands of Akaranger (actually a Gokai Changed Gokai Red who is also trying his best Akaranger voice impression). This is not a depiction of his original demise, so he must have been brought back to be killed a second time.
Big Bad: Starts out as an Ensemble between Tsukasa and Marvelous, but it's really a Duumvirate between Narutaki/the fake Doktor G and Silva.
Justified Trope: Every one of those suits requires a person in a suit, making it a logistical and money challenge. Also, even with reducing Sentai's numbers and adding to Rider's numbers, all pictures of all the heroes still have the Sentai out number the Riders. Toei just made the numbers more even, or as even as possible when one show has a new Five-Man Band or at least a Power Trio for almost every one of its 35 years and another only got one hero per series until very recently and even then rarely getting to 5 Riders or more.
One of the most notable ones in the villain side is probably the Black Cross King from Himitsu Sentai Goranger and Gokaiger Goseiger Super Sentai 199 Hero Great Battle. He goes from being the first main villain of the Super Sentai franchise and the main villain of a movie where almost all Super Sentai powers needed to be used to defeat him to just a minor Dai-Zangyack general without much importance to the story who's defeated by Kamen Rider Double and Kamen Rider Accel in a Deleted Scene (thus, all he does in the final film is, uhhh, stand around). Meanwhile, the first villain of the Kamen Rider franchise, the Great Leader, is represented here by one of the protagonists, Kamen Rider Decade, who is the nominal leader of Dai-Shocker and yet again takes the name Great Leader.
Fake Shemp: Inevitable, even before one takes into account the actors who died, retired from acting, or are too busy.
Hijacked by Ganon: Inverted. In a movie with Akudos Gil, the Black Cross King, and Narutaki, the one piloting Big Machine is Diend.
Well, at least Narutaki is part of the Big Bad Duumvirate. But the other member? Silva.
Jerk Ass: Diend. He takes it to the next level by stealing and piloting the Big Machine...simply because he feels emotionally betrayed by Tsukasa who didn't inform him of his gambit beforehand.
Jerkass Has a Point: Many were shocked at Diend's turn towards the end of the movie, but it is understandable he would want to get back at Tsukasa and Marvelous, he did have a point. Compared to Joe who went from being at the point of tears after being betrayed by Marvelous, charging at him with his sword practically screaming in anger at him to, literally six minutes later after the truth was revealed, scolding Marvelous as if he drew a moustache on his face while he was asleep.
Mind Screw: The film's very premise, out of andIn-Universe. Nobody except Tsukasa and Marvelous seems to know why they're fighting. This causes Kaitou, Hina, Joe and Don to join forces and try to figure out what's going on.
Although there is no In-Universe reference to the events of the World of Shinkenger crossover in Decade which was the previous — and first ever — Sentai/Rider team-up, there are a couple of nods. Marvelous transforms into Shinken Red during his fight with Diend!Kaitou. Aside from that, one of the many revived monsters in the Shocker-Zangyack Alliance is Chinomanako, the Ayakashi that became the Big Bad in the World of Shinkenger arc after he stole Daiki's Diendriver, he only appears in the background but can be noticed at one point during the big battle getting beaten up by Kamen Rider Amazon.
The Rider/Sentai teamups in the movie are all nods to the Super Hero Time block itself, pairing up the shows that are running back-to-back during their time, like Hibiki and the Magirangers, Kiva and the Go-Ongers and even a pre-Super Hero Time example (Black with the Maskmen).
Decade personally defeating the Goseigers is, on top of the card-themed Counterpart Combat Coordination, also a subtle nod to the Super Sentai Dice-O trading card arcade game, which debuted alongside Goseiger, being a blatant Sentai counterpart to the Kamen Rider Ganbaride trading card arcade game, which debuted alongside Decade.
When the remaining heroes travel to the past via DenLiner, Owner mentions that the Kamen Riders lost "that slot" to the Super Sentai and the Super Sentai wouldn't have existed without "that slot". "That slot" is the original timeslot the Kamen Rider series had before Goranger came on and replaced it.
Never Trust a Trailer: The trailers and other promotional material suggested that it would be a big ol' slugfest of massive proportions between the complete forces of Riders and Rangers with Fourze and the Go-Busters as the frontliners. The actual plot can be best described as "Kaizoku Sentai Gokaiger vs. Kamen Rider Decade", there's only one actual army fight between some Riders and Rangers, and Fourze and the Go-Busters only appear in the first and third acts.
Shout-Out: In Super Hero Disaster #6, when Gai is discussing the name "Ranger", he says "On the other side of the ocean we're called Power Rangers".
In a later episode, after Blue Buster and Gorisaki try in vain to solve the mystery, it turns out that the letter wasn't a code, but a perfectly straightforward letter...that's asking for Akibaranger to be made official.
The Unfought: Finally subverted for Narutaki, who takes the form of Destron commander Doktor G, revealing that this and his previous Colonel Zol form are mere disguises rather than true identities. While Narutaki did not assume the Werewolf form of the original Colonel Zol in The Last Story, he does here assume Doktor G's Kani Lazer form, which is actually a whole new costume and much more powerful than the original. In this form, he is seen being easily able to hold off around a dozen Kamen Riders via, you guessed it, lasers. He is only defeated when the Tensou Sentai Goseiger lend their new reflect cards to Decade with Blade and Ryuki, allowing them to deflect Doktor G's lasers allowing them to finish him off with their respective finishers.
When the Gokaigers charge up the Gokai Galleon Buster with the OOO Keys, all subtitles show "Let's make a shOOOw of it!".
We Have Reserves: Tsukasa delivers a speech to his minions saying (paraphrased): "Your only strength is that you keep coming back no matter how often you're killed, so go out there fully expecting to die and don't give up until all the Rangers are defeated!"
"With Our Swords" Scene: Heroes from each side lend the other their powers: OOO loans the Gokaigers his Core Medals, which turn into Ranger Keys for his six single colored Combo forms, while the Goseigers loan Decade, Blade, and Ryuki their Attack Reflector cards in order to battle Kani Laser.
The Worf Effect: Painfully so; In the first scene Gokai Red manages to go toe-to-toe with almost no effort with the first seven Showa era Kamen Riders. This is the equivalent of a red belt (albeit in 35 different disciplines, though he only uses two here: Bioman's Red One and Kakuranger's Ninja Red) going against seven veteran black belts.