Here is the action-packed Comic-Con trailer for the NBC series Constantine, which David Goyer has adapted from the DC/Vertigo comic Hellblazer.  There is a ton of paranormal action here as John Constantine takes on a variety of demons from parallel planes of existence.  Constantine (see "'Constantine' to Series") is just one of four DC Comics-based TV series that are slated to air during the 2014-2015 season with the Batman prequel series Gotham debuting on Fox, The Flash heading to the CW, where iZombie is slated to debut in midseason.
 
Check out the first Constantine trailer here.