Episode 14 Cho Den-O Beginning
When the Hikari Studio appears in Den-O's World, Tsukasa finds himself in detective attire and in possession of a Rider Pass. He is then suddently possessed by Momotaros, who battles a Mole Imagin as Kamen Rider Den-O. After taking out the Imagin, M-Tsukasa walks off until Natsumi using her technique to drive the Imagin out of him and ending up in Yuusuke's body. After easily overcoming M-Yuusuke and treating him to pudding for answers, learning the imagin lost his phyiscal form before he runs off with Natsumi and Tsukasa in pursuit. However, while, Tsukasa is possesed by Urataros who attempts to woe Natsumi until Kintaros and Ryutaros getting in the possession act as they are bent on stopping Decade. Tsukasa manages to get the three out of him, deciding to take Natsumi as their host to fight Decade. Using Agito's powers, while two villians are up to no good, Decade battles Den-O's Gun, Axe and Rod Forms as both Riders find themselves in the place Natsumi recognizes as the site of the Rider War where the fight ends in a draw as the the Den-Liner arrives to pick them up. While this occured, M-Yuusuke runs into Kaito who demands the Den-Liner from him, resulting in a fight between Den-O and Diend with Narutaki as the world's impending crisis draws near.