Question: Who plays Nucky Thompson in the television series in which "Nights in Ballygran" is an episode in?
Context: "Boardwalk Empire" is an American television series created by Terence Winter and based on the book "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  The series debuted on September 19, 2010, and concluded on October 26, 2014 on HBO, consisting of 56 episodes over five seasons.  Set in Atlantic City, New Jersey, during the Prohibition era, the series stars Steve Buscemi as Enoch "Nucky" Thompson (based on the historical Enoch L. Johnson), a political figure who rose to prominence and controlled Atlantic City, New Jersey, during the Prohibition period of the 1920s and 1930s.  The series received widespread critical acclaim, winning various awards including Golden Globe Awards for Best Drama Series and Best Actor in a Television Drama Series for Buscemi for its first season. The third season of the HBO television series "Boardwalk Empire" premiered on September 16, 2012 and concluded on December 2, 2012, consisting of 12 episodes.  The series was created by Terence Winter and based on the book "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Set in Atlantic City, New Jersey, during the Prohibition era, the series stars Steve Buscemi as Enoch "Nucky" Thompson (based on the historical Enoch "Nucky" Johnson), a political figure who rose to prominence and controlled Atlantic City, New Jersey, during the Prohibition period of the 1920s and early 1930s.  Taking place 16 months after season two, the third season begins on New Year's Eve 1922 and concludes in June 1923.  The third season was released on DVD and Blu-ray in region 1 on August 20, 2013. The fifth and final season of the HBO television series "Boardwalk Empire" premiered on September 7, 2014, and concluded on October 26, 2014, consisting of 8 episodes.  The series was created by Terence Winter and based on the book "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Set in Atlantic City, New Jersey, during the Prohibition era, the series stars Steve Buscemi as Enoch "Nucky" Thompson (based loosely on the historical Enoch "Nucky" Johnson), a political figure who rose to prominence and controlled Atlantic City, New Jersey, during the Prohibition period of the 1920s and early 1930s.  The fifth season takes place between April and October 1931, seven years after the previous season, during the Great Depression, with flashbacks to 1884 and 1897 detailing Nucky's childhood and young adulthood.  The fifth season was released on DVD and Blu-ray in region 1 on January 13, 2015. "Eldorado" is the series finale of the HBO series "Boardwalk Empire".  It is the eighth episode of the fifth season, and the 56th episode of the series overall.  The episode was written by series creator Terence Winter and executive producer Howard Korder, and was directed by executive producer Tim Van Patten.  It aired on October 26, 2014.  It portrays protagonist Nucky Thompson trying to tie up loose ends before retiring from the bootlegging business, as his past comes back to haunt him. The second season of the HBO television series "Boardwalk Empire" premiered on September 25, 2011 and concluded on December 11, 2011, consisting of 12 episodes.  The series was created by Terence Winter and based on the book "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Set in Atlantic City, New Jersey, during the Prohibition era, the series stars Steve Buscemi as Enoch "Nucky" Thompson (based on the historical Enoch L. Johnson), a political figure who rose to prominence and controlled Atlantic City, New Jersey, during the Prohibition period of the 1920s and 1930s.  The second season takes place between February and August 1921.  The second season was released on DVD and Blu-ray in region 1 on August 28, 2012. Boardwalk Empire is an American period crime drama television series created by Terence Winter and broadcast on premium cable channel HBO.  The series is set in Atlantic City, New Jersey during the Prohibition era and stars Steve Buscemi as Nucky Thompson.  Winter, a Primetime Emmy Award-winning screenwriter and producer, created the show, inspired by the book "Boardwalk Empire: The Birth, High Times, and Corruption of Atlantic City" by Nelson Johnson about historical criminal kingpin Enoch L. Johnson. "Nights in Ballygran" is the fifth episode of the first season of the HBO television series "Boardwalk Empire", which premiered October 17, 2010.  It was written by co-executive producer Lawrence Konner and directed by Alan Taylor. The first season of the HBO television series "Boardwalk Empire" premiered on September 19, 2010 and concluded on December 5, 2010, consisting of 12 episodes.  The series was created by Terence Winter and based on the book "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Set in Atlantic City, New Jersey, during the Prohibition era, the series stars Steve Buscemi as Enoch "Nucky" Thompson (based on the historical Enoch L. Johnson), a political figure who rose to prominence and controlled Atlantic City, New Jersey, during the Prohibition period of the 1920s and 1930s.  The first season takes place between January and November 1920, beginning with the start of national prohibition and ending with the 1920 presidential election. "Boardwalk Empire" is the pilot episode of the HBO crime drama "Boardwalk Empire".  Written by series creator Terence Winter and directed by Martin Scorsese with a budget of $18 million, the episode introduces the character of Nucky Thompson, played by Steve Buscemi, as the corrupt treasurer of Atlantic City who is involved in gambling and bootlegging in 1920.  The show used a large ensemble cast and a specially constructed boardwalk set to re-create the Prohibition and Jazz Era, and was based on "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Filming for the pilot took place at various locations in and around New York City in June 2009.  The episode first aired in the United States on September 19, 2010. Thomas Ernest Aldredge (February 28, 1928 – July 22, 2011) was an American television, film and stage actor, best known for various appearances in movies, theatre and television, with a notable role as Hugh De Angelis on "The Sopranos".  He also appeared in the television shows "Damages" as Uncle Pete and "Ryan's Hope".  He won a Daytime Emmy Award for playing the role of Shakespeare in "Henry Winkler Meets William Shakespeare" (1978).  His last role was on the HBO series "Boardwalk Empire", playing the father of Nucky Thompson (Steve Buscemi).
Answer: Steve Buscemi