Kamen Rider: Dragon Knight is an American science fiction superhero television series that originally aired on The CW, as part of the CW4Kids programming block, from December 13, 2008 to December 26, 2009. It is an adaptation of the Japanese tokusatsu show Kamen Rider Ryuki and is the second installment in the Kamen Rider franchise to be adapted for American audiences after Saban's Masked Rider in 1995. The series was developed for television by Steve and Michael Wang and produced by Jimmy Sprague through Adness Entertainment.

Ha Na and Doo Na were twin sisters who were very close to each other until Doo Na died a terrible death. One day, the usually bright and energetic Ha Na finds herself changing. She has superhuman strength and can do things that nobody can. Ha Na realizes that Doo Na's spirit has inhabited her body. Shin Ryu, a criminal psychoanalyst, uses Ha Na's powers to kill people that cannot be punished by the law.