Question: What year did the second series of the show Colin Morgan is best known for begin?

Context paragraphs:
Merlin (series 2): The second series of "Merlin", is a British fantasy television series which began on 19 September 2009 and ended on 14 December 2012.  Series two regular cast members include Colin Morgan, Bradley James, Katie McGrath, Angel Coulby, Anthony Head, Richard Wilson, and John Hurt as the voice of the Great Dragon.  Series two contains thirteen episodes and had 5.77 million viewers for the premiere with 6.64 million viewers for the series finale.  Series 2 was the first series to have a two-parter and the only series to have a two-parter mid-series.  BBC renewed the show for the third series which premiered on 11 September 2010.

List of Casualty episodes: <section begin=head />The following is a list of the show "Casualty" episodes.  "Casualty" premiered on 6 September 1986, and was originally commissioned for fifteen episodes.  Series One concluded on 27 December 1986, and following its success a second series was commissioned.  "Casualty" has continued running ever since, with the thirty first series of "Casualty" airing on 27 August 2016.

Live at the Electric: Live at the Electric is a British comedy series broadcast on BBC Three since 31 May 2012.  The show is hosted by comedian Russell Kane who performs stand-up in between comedy sketches from a variety of performers such as Joe Wilkinson and Diane Morgan's double act "Two Episodes of Mash".  It also features comedy duo Totally Tom serving as backstage crew for the show.  The second series started on 4 July 2013 and ended on 22 August 2013.  A third series began on 10 January 2014.

Merlin (series 1): The first series of "Merlin", a British fantasy television series, began on 20 September 2008 and ended on 13 December 2008.  Regular cast members for the first series include Colin Morgan, Bradley James, Katie McGrath, Angel Coulby, Anthony Head, Richard Wilson, and John Hurt as the voice of the Great Dragon.  The first series contained thirteen episodes, with 7.15 million tuning into the premier and 6.27 for the series finale.  It was the only series to be comprised completely of stand-alone episodes.  Before the series finale, the BBC confirmed that the series was renewed for a further 13 episode second series.  Series two premiered on 19 September 2009.

List of Merlin episodes: "Merlin" is a British fantasy-adventure television programme created by Julian Jones, Jake Michie, Julian Murphy, and Johnny Capps, starring Colin Morgan in the title role.  It was broadcast on BBC One from 20 September 2008 to 24 December 2012.  The show is loosely based on the Arthurian legends of the young wizard Merlin and his relationship with King Arthur, but it differs from traditional versions.  The show was influenced by the US drama series "Smallville" about the early years of Superman, and was produced by independent production company Shine Limited.

Colin Morgan: Colin Morgan (born 1 January, 1986) is a British/Irish film, television, theatre and radio actor best known for playing the title character in the BBC fantasy series "Merlin", the lead in "The Living and the Dead", and main roles in "Humans" and "The Fall"; his stage role as Ariel in "The Tempest"; and film roles in "Testament of Youth", "Legend" and "".

Merlin (2008 TV series): Merlin is a British fantasy-adventure drama television programme created by Julian Jones, Jake Michie, Julian Murphy, and Johnny Capps, starring Colin Morgan in the title role.  It was broadcast on BBC One from 20 September 2008 to 24 December 2012 for a total of 65 episodes.  The show is loosely based on the Arthurian legends of the young wizard Merlin and his relationship with King Arthur, but it differs from traditional versions.  The show was influenced by the US drama series "Smallville" about the early years of Superman, and was produced by independent production company Shine Limited.

Backchat (2013 TV series): Backchat with Jack Whitehall and His Dad, or simply Backchat, is a chat show that was originally broadcast on BBC Three but moved to BBC Two for its second series.  The show is presented by comedian Jack Whitehall and his father Michael Whitehall, a theatrical agent and who used to manage celebrities such as Colin Firth and Judi Dench.  The chat show consisted of various games and quizzes presented towards celebrities who were guests on the episode, and began airing from 20 November 2013.  In June 2014, "Backchat" returned for two summer specials in aid of the World Cup and Father's Day.

Colin's Sandwich: Colin's Sandwich was a British sitcom, broadcast on BBC2 in 1988 and 1990, which starred Mel Smith as Colin Watkins, a British Rail administrator who aspired to be a horror writer.  The show was written by Paul Smith and Terry Kyan and ran for two series of six episodes (18 October – 22 November 1988 and 12 January – 16 February 1990).  In the second series, Colin manages to achieve some small successes as a writer.

Meat (Torchwood): "Meat" is the fourth episode of the second series of British science fiction television series "Torchwood", which was first broadcast by BBC Two on 6 February 2008.  It was written by Catherine Tregenna, who had previously written episodes for the first series of the show, directed by Colin Teague and produced by Richard Stokes and Chris Chibnall.  The episode featured the five initial series regulars John Barrowman, Eve Myles, Burn Gorman, Naoko Mori and Gareth David Lloyd plus recurring actor Kai Owen in a central role.

Supporting paragraphs: Merlin (series 2) Colin Morgan
Answer: 2009