Constantine is the now cancelled NBC attempt to jump into the comic book game. But the show and its star, Matt Ryan, gained a following.
Including Arrow's Stephan Amell.
Amell started campaigning to get Ryan to appear as Constantine every since the NBC show got cancelled. And he finally got his wish.
Ryan is set to appear in character in a season 4 episode. CW president Mark Pedowitz described it as a "great, one-shot episode". It its unknown what the episode will be about or if Ryan will appear in more than one episode.
Ryan, for his part. seems happy to do it.
This might give me a reason to watch the one and only season of Constantine. I will admit that it was a show that I missed out on.