Kohki Okada (岡田 浩暉 Okada Kōki) played Groundain/Harumi Saeba in Kamen Rider Fourze the Movie: Everyone, Space is Here!. He reprised this role in a voice only appearance as Groundain in Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z.He also Played Kazuki Shirakawa in Kamen Rider Ex-Aid Episode 13 and 14.