Arata Kagami seeks to get the Hyper Zecter just like Souji Tendou, so he tries to emulate Tendou. Once he realizes that he has to be himself, the Hyper Zecter appears and allows him to transform into Kamen Rider Gatack Hyper Form.
as Souji Tendou / Kamen Rider Kabuto
as Arata Kagami / Kamen Rider Gatack
as Jyuka Tendou
as Kabuto Zecter (voice)
as Gatack Zecter (voice)
as Zecter Driver (voice)
