Kamen Rider Ryuki (仮面ライダー龍騎 Kamen Raidā Ryūki, Masked Rider Ryuki) is a Japanese tokusatsu television series. It was the twelfth installment in the Kamen Rider Series of tokusatsu shows. It was a joint collaboration between Ishimori Productions and Toei, and it was shown on TV Asahi from February 3, 2002 to January 19, 2003. The catchphrase for the series is "Those who don't fight won't survive!!" (戦わなければ、生き残れない!! Tatakawanakereba, ikinokorenai!!). In 2009, Ryuki was adapted into the American television series Kamen Rider Dragon Knight, the first adaptation of a Kamen Rider Series in the United States since Saban's Masked Rider in 1996.