Fear's Pet Strategy, Drop Rider into Hell! (恐怖のペット作戦 ライダーを地獄へ落とせ！ Kyōfu no Petto Sakusen Raidā o Jigoku e Otose!) is the eighty-ninth episode of the original Kamen Rider series. It introduces the final theme change of the series, with Rider Action, which previously served as ending theme since episode 72 being moved to opening theme, replacing Let's Go!! Rider Kick (Masato Shimon ver.) which debuted in episode 14, while a new song, Lonely Kamen Rider, takes Rider Action's place as ending theme. This theme line-up would last to the series' end.