While terrorizing people, Leangle is photographed by King, the Caucasus Undead in human guise. Kenzaki asks Aikawa to join them, but Tachibana does not trust him. King creates a website to slander the Kamen Riders and everyone seeks him out. Kenzaki encounters King, but has his Blay Buckle stolen by the Scarab Undead, who can stop time. Tachibana finds Mutsuki in a bar and learns of Aikawa true identity as the Joker Undead. Kenzaki retrieves his Blay Buckle, but Aikawa is abducted by the two other Undead. Kenzaki then encounters Trial D, an Undead that cannot be sealed.

Garren arrives to assist Blade and drives off the new Undead. Tachibana tells everyone about Aikawa's identity as the Joker Undead. Meanwhile, King holds Aikawa and forces him to transform into his Joker form, which he uses to escape. Tachibana meets Hirose's father, who is behind the Trials. Kenzaki finds Aikawa and learns about how he changed from the Joker Undead to Hajime Aikawa. King and the Scarab Undead appear and fight Blade. Aikawa helps Blade seal the Scarab Undead while King flees.

Another Trial Undead is hot on Kenzaki's trail, he can also use Kenzaki's moves! Meanwhile, Hajime can no longer control himself and fights assuming his Joker form.