Dubstyle is a genre of electronic dance music, based on the fusion of hardstyle and dubstep.

It was introduced to audiences by artists Headhunterz and Brennan Heart in March 2010, with the track "The MF Point of Perfection" on the album Studio Sessions, which followed a formulaic dubstep bassline, but stuck with the Hardstyle melody and synthesizer.

Another release was made by Zany for the event "The Great Zany Show". The genre was also touched upon by Wragg & Log:One in 2009 with their remixes of Rodi Style's "We're Gonna Rock You" and Neal Thomas' "Pyrotechno", although these tracks are more Hard Trance than Hardstyle.
The vast majority of Dubstyle producers are current/former Hardstyle producers, as opposed to Dubstep producers.

http://en.wikipedia.org/wiki/Dubstyle

Related Subreddits:
http://www.reddit.com/r/dubstep
http://www.reddit.com/r/hardstyle