Note: This is a spoiler-free review of the first five mini-episodes of Constantine: City of Demons, which premiered at WonderCon and are now available to stream on CW Seed. Leave it to a trickster like John Constantine to weasel his way out of network cancellation. NBC may have pulled the plug on its Constantine series in 2015, but the character himself has found a second home in the Arrow-verse as an ally to heroes like Green Arrow and White Canary.