Gaia Impact

The Gaia Impact is an event that the series Kamen Rider Double revolves around. The plan was first thought of by Ryubee Sonozaki after his son, Raito Sonozaki (now known as Philip) died after falling into the Gaia Memory but was reborn as an avatar for it by the planet's powers. Ryubee planned for the Gaia Impact to occur to ensure the future of the human race by making them one with the planet much like Philip.

By selling the Gaia Memories to bidders and common criminals, they are used as test animals to study the Gaia Memories for the Gaia Impact. The Kamen Riders using Gaia Memories are also somewhat used for these tests as they were used for data to perfect Ryubee's plans for his youngest daughter, Wakana Sonozaki to become ClayDoll Xtreme. Ryubee then captures Philip and sacrifices him to the Gaia Memory again as he becomes a living Gaia Memory to make Wakana one with the planet. When all goes according to plan, Philip's partner, Shotaro Hidari, extracts him from Wakana by transforming into Kamen Rider Double, causing an explosion that destroys most of the Sonozaki Estate.

When Ryubee died in the burning remains of his estate, the plan of the Gaia Impact still remains and continued over to Foundation X.