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?

Context paragraphs:
Mary-Kate and Ashley in Action!: Mary-Kate and Ashley in Action!  is an animated television series featuring the voices and likeness of Mary-Kate and Ashley Olsen.  It is also a series of books that spun off, from the show.  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.  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.

Manhunter (Kate Spencer): Manhunter (Kate Spencer) is a fictional character, a superheroine appearing in DC Comics.  She is the eighth DC Comics character depicted using the name Manhunter, and the first female to do so.  The character first appears in "Manhunter" (vol.  3) #1 (October 2004) and was promoted by DC Comics as relevant to the popular "Identity Crisis" limited series.

List of Arrow characters: Arrow is an American television series developed by Greg Berlanti, Marc Guggenheim, and Andrew Kreisberg, based on the DC Comics character Green Arrow.  Many of the other characters appearing in the series are also based on DC Comics characters.  The series premiered on October 10, 2012 in the United States on The CW television network, and is currently in its fifth season.  On January 8, 2017, The CW announced that "Arrow" would be renewed for a sixth season.

General Hospital cast members: "General Hospital" is the longest running American television serial drama, airing on ABC.  Created by Frank and Doris Hursley, the series premiered on April 1, 1963.  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.  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.  Ames made a special appearance on October 30, 2015.  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.  Actress Jacklyn Zeman — who portrays Bobbie Spencer — is the fourth longest-running cast member, joining the serial in December 1977.  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.  Former cast member Anthony Geary, who portrayed Luke Spencer, was the sixth longest-running cast member, having joined "General Hospital" in November 1978.  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.

The Man of Steel (comics): The Man of Steel is a 1986 comic book limited series featuring the DC Comics character Superman.  Written and drawn by John Byrne, the series was presented in six issues which were inked by Dick Giordano.  The series told the story of Superman's modern origin, which had been rebooted following the 1986 series "Crisis on Infinite Earths".

Charles Halford: Charles Halford (born February 28, 1980 in Salt Lake City, Utah) is an American actor.  In 2009, he starred in the DCOM "Dadnapped" as Skunk.  He has also co-starred in dozens of other television shows and films such as "The Luck of the Irish".  Halford was a main cast member on the NBC series "Constantine", portraying Francis "Chas" Chandler.

The Flash (season 4): The fourth season of the American television series "The Flash", which is based on the DC Comics character Barry Allen / Flash, follows a crime scene investigator with superhuman speed who fights criminals, including others who have also gained superhuman abilities.  It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of "Arrow".  The season is produced by Berlanti Productions, Warner Bros.  Television, and DC Entertainment, with Andrew Kreisberg and Todd Helbing serving as showrunners.

Green Lantern: The Animated Series: Green Lantern: The Animated Series is an American computer-animated television series based on the DC Comics superhero Green Lantern.  The series aired on Cartoon Network, as part of their "DC Nation" television block.  A one-hour sneak peek aired on November 11, 2011, it ran from March 3, 2012, until March 16, 2013, with a preview special airing on November 11, 2011.  A special screening of the first episode was shown at New York Comic Con 2011 on October 15, 2011.  This was the first Green Lantern television series and the first CGI DC/WB series.  The series was cancelled after one season due to poor toy sales from the live-action movie.

John Noble: John Noble (born 20 August 1948) is an Australian actor and theatre director of more than 80 plays.  He is best known for his roles as Dr. Walter Bishop in the American Fox science fiction television series "Fringe", and Henry Parrish in the Fox action-horror series "Sleepy Hollow".  His most high-profile film role was as Denethor in Peter Jackson's "The Lord of the Rings" trilogy.  He also provided the voice of the DC Comics supervillain Scarecrow in the 2015 video game "", where his character served as the main antagonist.  In 2015, he joined the main cast of the television series "Elementary" as Sherlock Holmes's father.  He was also cast as a doctor in the Australian TV series "All Saints."  In 2012, Noble was diagnosed with osteoporosis.  His charity, Noble Bones, helps to raise awareness for the disease.

Constantine (TV series): Constantine is an American television series developed by Daniel Cerone and David S. Goyer for NBC, featuring the DC Comics character John Constantine.  Matt Ryan stars as Constantine, a British exorcist and occult detective who actively hunts supernatural entities.  The series aired from October 24, 2014 to February 13, 2015, over 13 episodes.  On May 8, 2015, NBC canceled "Constantine" after only one season due to poor ratings.  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.

Supporting paragraphs: Charles Halford Constantine (TV series)
Answer: poor ratings