Supplementary Plan Forever (Part I)

Supplementary Plan Forever (Part I) (補完計画よ永遠に(前編)) is the fifteenth and penultimate episode of Kamen Rider Zi-O: Supplementary Plan. It was released on TTFC accompanying the fifteenth episode of Kamen Rider Zi-O, as well as the film Kamen Rider Heisei Generations FOREVER, as its "episode 15.5".