RX! Dai-Shocker Attack (RX！大ショッカー来襲 Āru Ekkusu! Daishokkā Raishū) is the twenty-sixth episode of Kamen Rider Decade. It is the first part of the World of Black RX/World of Black arc, featuring the first appearance of Dai-Shocker and its commander Apollo Geist (Guy), who serve as the antagonists for the remainder of the series, and of Showa Kamen Riders in what originally started as a celebration of the 10th anniversary of the Heisei Kamen Rider Series.