|This article is about a/an group of villains in Kamen Rider Wizard and Kamen Rider Fourze.|
The evil Akumaizer (アクマイザー Akumaizā?) are the main antagonists of Movie War Ultimatum. They are the last remnants of the Akuma Clan (アクマ族 Akuma Zoku?) from the Demon World (魔界 Makai?) that were seen by humans of several thousand years ago as "devils" (悪魔 akuma?) and were pushed underground. They receive five Gates from the Phantoms and make the Infinite Monster Plant (無限モンスタープラント Mugen Monsutā Puranto?) which revives the Dopants, Yummy, and Zodiarts that were previously defeated by the Neo-Heisei Era Riders to make a Monster Army (怪人軍団 Kaijin Gundan?) to invade and conquer humanity.
- Main article: Xatan
Xatan (ザタン Zatan?) is the leader of the Akumaizer who is able to use the Underworld's magic. He plans on taking over the world together with his subordinates Eel and Gahra. He is destroyed by Wizard's Special Dragon Rush.
Xatan is a homage to Xavitan from Akumaizer 3, who is also the leader of the team.
- Main article: Eel
Eel (イール Īru?) is the most agile and skilled fighter of the Akumaizer, skilled in aerial combat. He is destroyed by Fourze's Rider Super Galaxy Finish.
Eel is a homage to Evil from Akumaizer 3.
- Main article: Gahra
Gahra (ガーラ Gāra?) is the strongest of the Akumaizer. He has a large, muscular physique and has superhuman strength. He is later destroyed by Wizard's Double Flame Slash Strike from sacrificing himself to save Xatan.
Gahra is a homage to Gabra from Akumaizer 3.