This is a list of Kamen Rider Decade episodes. Following the first episode, every two episodes have taken place in an alternate dimension. The first nineteen episodes feature storylines based on the Heisei Kamen Rider Series. The latter half of the series features two story arcs that are original stories, a story arc serving as a crossover with Samurai Sentai Shinkenger, and two story arcs based on the Shōwa Kamen Rider Series. In addition to the 31 episodes, the story of Decade is also told in the films Kamen Rider Decade: All Riders vs. Dai-Shocker and Kamen Rider × Kamen Rider W & Decade: Movie War 2010.