The Cavalry: Kamen Rider #1 and Akaranger arrive with this and a large group of Riders and Sentai teams.
Demoted to Extra: All protagonists from the first Super Hero Taisen movie return here. Most of them have their roles reduced, but Decade is the one sidelined the most by that. Decade only appears as an extra for a battle scene with a single line, saying his own name, not even appearing among the heroes in the movie's final battle, unlike Kamen Rider OOO, Fourze, the Gokaiger and the Go-Busters.
Fake Shemp: Inevitable, even before one takes into account the actors who died, retired from acting, or are just too busy.
Gondor Calls for Aid: when they discover that they only have an hour to to stop Space Shocker before Gavan's higher ups Shoot the Dog to save the universe, Gai decides to perform this trope and call the Kamen Riders and Super Sentai teams for back up. As a result, throughout the film multiple groups of Sentai and Kamen Riders show up to join the battle. Inazuman (the one from Movie War Ultimatum) also arrives, apparently from the future.
Heroic Sacrifice: Subverted. The Space Sheriffs seemingly sacrifice themselves to save the Earth from the Super Dimensional Cannon, but survive and blast Psycho back to Earth when he tries to finish his plan.
I Will Fight No More Forever: In the end, J shows up, sweeping the landscape but not helping his fellow Go-Busters as he's lost the will to fight after the series' end.
Let's You and Him Fight: Gavan type-G is charged with attempting to stop Space Shocker and is told their leaders use magic. This leads him to think Kamen Rider Wizard and Beast are the bad guys and goes out to murder them.
Loads and Loads of Characters: Once again, we got characters from the Super Sentai and Kamen Rider franchises showing up, this time those from the Space Sheriff series'll appear, as well as Shotarou Ishinomori-based characters like the Space Ironmen and Inazuman, and if that's not enough, we're also getting a buttload of other Metal Heroes (see Unexpected Character).
Milestone Celebration: With Space Crime Syndicate Madou as the villains, the revival of Reider and the return of Shōzō Iizuka as Demon King Psycho, and the new Sharivan, Kai Hyuga, having a supporting role, this can be considered somewhat of a homage to the 30th anniversary of Space Sheriff Sharivan, following on from the celebration of the 30th anniversary of Gavan the previous year.
Mythology Gag: First there's the obvious ones: we're seeing a lot of characters come back, and a lot of past technology does everything it used to do with updated effects, recreating a lot of beloved Stock Footage sequences beautifully and making those who grew up with them drool. However, there's one less obvious one: When Kikaider appears at the end, he says that these are not the only heroes of Earth. This is reminiscent of Movie Wars 2010, where Ryu Terui/Kamen Rider Accel, foreshadowing his upcoming introduction in Kamen Rider Double, says that Double is not the only Kamen Rider in Fuuto.
Nice Job Breaking It, Hero: If the Space Sheriffs' bosses hadn't fired the Super Dimensional Cannon trying to destroy the Earth in a Shoot the Dog, the movie probably would have ended with Strategist Raider's demise.
Oh, Crap: The army of enemy kaijin react this way to seeing an army of Sentai teams and Kamen Riders preparing their finishing moves all at once.
The Only One Allowed to Defeat You: After Geki saves Skydain from being Blown Out The Airlock, the Kyodain develop this attitude towards Gavan; they even save him from other Space Shocker members at one point just so they can fight him, which gets them killed by Space Ikadevil.
SpaceX: Space Shocker, lead by Space Ikadevil and Space Spider Man.
The Stinger: An after credits scene reveals Kikaider, teasing at the upcoming movie.
Unexpected Character: Jiraiya, Jiban, Draft Redder, Janperson, Blue Beet and B-Fighter Kabuto. As only the Space Sheriffs appeared in early promotional material, and the title of the movie is Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z rather than Kamen Rider × Super Sentai × Metal Heroes: Super Hero Taisen Z, it was assumed that the Space Sheriffs would be the only Metal Heroes to appear. This marks the first appearance of other Metal Heroes besides the Space Sheriffs after the Metal Heroes revival started in Gokaiger vs. Gavan.
While nothing is confirmed yet, the Net Movies feature a copyright mention of Marvel Comics, which might indicate an appearance by Supaidaman himself.note As it turns out, Geki is telling a story in one episode and in it, Kamen Rider Stronger accuses Yoko-as-Tackle of having an affair with Spidey!