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?

<P0-S0> Mary-Kate and Ashley in Action! <P0-S1>  is an animated television series featuring the voices and likeness of Mary-Kate and Ashley Olsen. <P0-S2>  It is also a series of books that spun off, from the show. <P0-S3>  The show premiered on October 20, 2001 on the ABC block Disney's One Saturday Morning, and was cancelled after one season due to negative ratings. <P0-S4>  Reruns were later shown on Toon Disney and will be seen on Nickelodeon in 2016, as part of the network's purchasing of the television rights to Mary-Kate and Ashley's TV series and movies. <SEP> <P1-S0> "General Hospital" is the longest running American television serial drama, airing on ABC. <P1-S1>  Created by Frank and Doris Hursley, the series premiered on April 1, 1963. <P1-S2>  The longest-running cast member is Leslie Charleson, who has portrayed Dr. Monica Quartermaine since August 17, 1977, also making her one of the longest-tenured actors in American soap operas. <P1-S3>  Former cast member Rachel Ames was previously the series' longest-running cast member, portraying Audrey Hardy from 1964 to 2007, and making guest appearances in 2009 and 2013, the latter for the series' fiftieth anniversary. <P1-S4>  Ames made a special appearance on October 30, 2015. <P1-S5>  Actors Genie Francis and Kin Shriner, who portray Laura Spencer and Scott Baldwin, are the second and third longest-running cast members, having joined "General Hospital" in February and August 1977, respectively. <P1-S6>  Actress Jacklyn Zeman — who portrays Bobbie Spencer — is the fourth longest-running cast member, joining the serial in December 1977. <P1-S7>  Actress Jane Elliot, who joined the serial in June 1978 as Tracy Quartermaine, is the fifth longest-running cast member, joining "General Hospital" in June 1978 until her departure in May 2017. <P1-S8>  Former cast member Anthony Geary, who portrayed Luke Spencer, was the sixth longest-running cast member, having joined "General Hospital" in November 1978. <P1-S9>  The following list is of cast members who are currently on the show: the main and recurring cast members, or those who are debuting, departing or returning to the series. <SEP> <P2-S0> Charles Halford (born February 28, 1980 in Salt Lake City, Utah) is an American actor. <P2-S1>  In 2009, he starred in the DCOM "Dadnapped" as Skunk. <P2-S2>  He has also co-starred in dozens of other television shows and films such as "The Luck of the Irish". <P2-S3>  Halford was a main cast member on the NBC series "Constantine", portraying Francis "Chas" Chandler. <SEP> <P3-S0> Constantine is an American television series developed by Daniel Cerone and David S. Goyer for NBC, featuring the DC Comics character John Constantine. <P3-S1>  Matt Ryan stars as Constantine, a British exorcist and occult detective who actively hunts supernatural entities. <P3-S2>  The series aired from October 24, 2014 to February 13, 2015, over 13 episodes. <P3-S3>  On May 8, 2015, NBC canceled "Constantine" after only one season due to poor ratings. <P3-S4>  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.