|This article is about a/an episode in Kamen Rider: Dragon Knight.|
Kamen Rider Siren is the twenty-third episode of Kamen Rider: Dragon Knight. It is the debut of Kamen Rider Onyx
Kase isn't willing to accept Kit as the new Dragon Knight, and challenges him to a fight. James gives Danny one last chance to forget revenge and keep his promise to Xaviax- or else he'll be vented. A mysterious Rider in black attacks Kit.
Danny tells Xaviax about Kamen Rider Siren, who Xaviax thought he destroyed. Becoming suspicious of Danny, he orders JTC to vent him. Kase tells Len about how she survived before being introduced to Kit. Kase challenges him to a fight, to see if he has what it takes to be a real Kamen Rider, and Kit loses. Lacey tries to get a job at the bookstore to keep an eye on Maya. Michelle Walsh, revealed to be a Government Agent, delivers Maya's information to her boss who orders her to bring Kit in. JTC confronts Danny about disobeying Xaviax and nearly vents him before deciding to give him one last chance. At home, Kit continues to feel frustrated and is then attacked by Kamen Rider Onyx.
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- The first appearance of Kamen Rider Onyx.