Question: Charles Halford was a main cast member on an American television series featuring a DC comics character that was cenceled after only one season due to what?
Sentence (from "Constantine (TV series)"): Ryan reprised the role in a guest appearance in the fourth season of The CW series "Arrow", set within the Arrowverse, and it was announced in January 2017 that he would voice the character in an animated web series on The CW Seed later that year.
Relevant evidence: No