WARNING:This special contains scenes of blood, nudity and continuous graphic violence. Viewer discretion is advised!
Kamen Rider Brave ~Let's Survive! Revival of the Beast Rider Squad!~ (仮面ライダーブレイブ ~Surviveせよ! 復活のビーストライダー·スクワッド~,Kamen Raidā Bureibu ~Sabaibu Seyo! Fukkatsu no Bīsuto Raidā·Sukuwaddo~) is a Toei Tokusatsu Fan Club-exclusive special of Kamen Rider Ex-Aid. A 7-minute preview of this special was uploaded onto Toei's official YouTube channel for Japanese viewers only.
A group of revived beast-themed Riders gather to form the "Beast Rider Squad"... and Kamen Rider Ouja, the worst villain Rider, is leading them! Can Kamen Rider Brave hunt them with his new Gashat, "Night of Safari"? And what is the secret behind this battle?
Additionally, the special's title contains the word "Survive", an important theme in Ryuki, being the name of its primary Rider Power-Up form and part of the season's tagline, "If you don't fight, you won't survive." Asakura himself even said to Hiiro that "if you don't fight, you will die."
The King Dark that appears here is revealed to be just a hologram used by the Foundation X agent. This is rather pertinent as he was the opponent of Kamen Rider X.
It is currently unknown why Kosuke Nitoh/Kamen Rider Beast is "revived" in this special since there is no proof about Kosuke's death in the main timeline. It is possible that it may have been the Magic Land counterpart who was wiped from existence after Magic Land disappeared, though in either case, Beast is the only heroic Rider to appear as a "villain" in this special, counting Sasword's villainous role as the Scorpio Worm.
With the special featuring the "Beast Rider Squad", it's possible including a Rider already named "Beast" was simply for this connection.
Given Foundation X's involvement, it is possible that this Kamen Rider Beast is an energy construct duplicate of the original. This was done previously by Foundation X in the Movie War films when they made duplicates of the Horoscope Zodiarts and other Kamen Rider villains.
Interestingly and ironically, Toshiki Seto (the actor of Hiiro) had said his favorite Kamen Rider is Ouja.
The scene where Asakura eats mackerel fish is a reference to Choukou Senshi Changéríon episode 10 This Isn't Mackerel! (サバじゃねぇ！,Saba Ja Nee!), which is a popular meme in Japan.
The main hero of this show, Changéríon, was also played by the same actor of Asakura.
Ouja using Sasword and Beast as a shield to defend himself from Brave Level 4's attack is a callback to episode 19 of Ryuki, where Ouja uses Kamen Rider Gai as a shield to defend himself from Zolda's Final Vent.
There are several references to horror movies in this special:
When Mizuki is attacked while taking a shower, the scene is an obvious homage to a scene with the same motif in the film Psycho, however, the way the Rider attacks her is more similar to how Freddy Krueger operates.
Additionally, the way Ouja stalks and preys on his victims is similar to the modus operandi of killers from slasher films such Jason or Leatherface.