|This article is about a/an kaijin in Kamen Rider Fourze.|
Suddendath Beta (サドンダスβ Sadondasu Bēta) is the upgraded version of Suddendath and main antagonist of the Kamen Rider Fourze Hyper Battle DVD: Rocket Drill States of Friendship, where he attempts to avenge his predecessor's death by attacking Amazon, then Fourze, though the Rider and monster were evenly match, as they fought continuously for over a week. He was destroyed by Fourze Rocket Drill States. If the Amazon choice as selected, he simply runs away crying.
Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
Suddendath Beta was part of the endlessly reviving army of Shocker in the amusement park Game World. Emerging as a result of Kuroto Dan's plot to revive himself, they would persistantly attack, no matter how many times defeated, the Kamen Riders he had gathered for this purpose. Once the Game World was destroyed by Kazuma Kenzaki's Joker Undead power, the Shocker army was assembled one last time under Kamen Rider Genm Zombie Gamer and Totema, but was ultimately wiped out by Kamen Rider Ex-Aid Maximum Gamer Level 99 and the second Kamen Sentai Gorider.
- By extension as a modification of the Suddendath costume, Suddendath Beta is based on the design of Suddendass of the Skyrider movie, Eight Riders vs. Galaxy King, him fighting Skyrider in Kamen Rider Taisen references this.