And a brief one by Rina Akiyama (Naomi) as Adam's girlfriend Sara.
Network to the Rescue As mentioned before Dragon Knight 's ratings were terrible, nevertheless both 4Kids and the CW backed the show to the last claiming that it's still a really good show and ratings don't always reflect that.
Screwed by the Network: CW 4 Kids dropped the show just two episodes short of the series finale. Proof here. On the other hand, they did finish the series off online (before it even stopped airing!) though for what it's worth, one of the unaired episodes was yet another Clip Show.
As for why: 4Kids ends shows in December and starts new ones in January. Kamen Rider didn't quite finish its run by New Years', so tough luck.
Also as mentioned under Network to the Rescue they had plenty of chances to cancel it due to its low ratings, but refused to do so because they really liked the show.
What Could Have Been: The show's producers have said that they originally wanted to adapt a different Kamen Rider (the rumors variously say Faiz or Blade), but were made to do a series with more Riders (and therefore more merchandise). They've also said that if Dragon Knight did well enough, they would've gone for the passed-over series next.