It looks like everyone’s favorite Scouse Occultist will be returning to the main DC Universe as part of their Flashpoint event. Click for the details..
John Constantine debuted in the pages of Swamp Thing, which was then a part of the main DCU. However when he got his own spin off title(Hellblazer) DC had being making moves to create a more adult imprint for some of its more edgy or occult themed characters. So Constantine, along with Swamp Thing, Sandman and others reformed under the Vertigo imprint.