Kamen Rider Saber × Ghost will introduce three new characters - Kamiiyu (left), Robes (center) & Muller (right). These are the scientists from Gamma World & also the subordinates of Danton who was defeated in Ghost RE:BIRTH: Kamen Rider Specter.
Terumi as Kamiiyu
Takashi Kitadani as Robes / Gamma Superior
Kosei Sakurada as Muller
After Danton's death, they take over his legacy of human remodelling who can live in Gamma World.
By the way, Toei had confirmed that this Kamen Rider Saber × Ghost Spin-off is a direct Sequel to Ghost RE:BIRTH: Kamen Rider Specter.
Robes will also transform into Gamma Superior and fight against Takeru.
Guess Desast had joined hands with the three scientists to kidnap Kanon-chan.
Meanwhile, the ex-Gamma Superior - Jabel tries to transform with a Onigiri?