On the Other Side of the Rainbow

Houtaro, who was spirited away from Rinne and the others by a giant egg, finds himself in a black space with a floating blue egg. "What is this place? Who are you?" Houtaro asks the egg. Gigist stands before Supana, who was on his way to rescue Houtaro. Supana transforms into Kamen Rider Valvarad, only for Gigist to unleash the mighty Malgam, which he had created by rallying his Chemies, on Kamen Rider Valvarad!