If you're familiar with Vertigo's Hellblazer series, you've likely noticed quite a few elements from it on NBC's Constantine. Not only does the series draw its three main characters directly from the comic, but it's also gone so far as to adapt actual storylines, such as November 14th's "A Feast For Friends."

Of course, if you're not all that familiar with Hellblazer, it's not too late to become aquainted. In this exclusive new featurette, Executive Producers David S. Goyer and Daniel Cerone, DC Entertainment Chief Creative Officer Geoff Johns and stars Matt Ryan, Angelica Celaya and Charles Halford discuss the series that inspired their show, as well as the importance of John Constantine to the comic book medium.

Episode 7 of Constantine, "Blessed are the Damned," airs Friday, December 5th at 10 p.m. (9 p.m. CST) on NBC. If you'd like check out Hellblazer, the entire series is available digitally in the DC Digital Comics Store.