Kamen Rider 1 and Kamen Rider Dark Ghost: "Rider Henshin!" ( ライダー変身!, Raidā Henshin!).Variations of this phrase have been used by various Riders, either when transforming or switching between forms. Generally, most Kamen Riders call out "Henshin!" during their transformation sequences. It has since become an integral aspect rooted within the Kamen Rider series. The first use of the phrase was by Kamen Rider 2, as the original Kamen Rider did not have a transformation call before that. The protagonist of the novella is transformed into an inhuman, bug-like creature against his will, a recurring theme of the Kamen Rider Series. It is said to have been the suggestion of producer Toru Hirayama, based on the Japanese title of Franz Kafka's novella Metamorphosis. In the Kamen Rider Series, it is a common transformation call for what a Rider shouts when they are about to transform.
"Henshin!" ( 変身, Henshin) is the Japanese word for "transformation/transform" meaning "to change or transform the body" or "equip". This article is about a common trend in the Kamen Rider Series.