Question: Calvary is a 2014 Irish drama film written and directed by John Michael McDonagh, it stars which Irish actor, best known for comedic roles such as Roy Trenneman in the Channel 4 comedy "The IT Crowd"?

Context articles: John Michael McDonagh
Glassland
Calvary (film)
War on Everyone
Chris O'Dowd
The Guard (2011 film)
Pauline McLynn
Ned Kelly (2003 film)
The Guarantee
Patrick's Day (film)

John Michael McDonagh is a screenwriter and film director with British and Irish nationality.
 He wrote and directed "The Guard" (2011) and "Calvary" (2014), both films starring Brendan Gleeson, receiving a BAFTA Award nomination for the former.
 He was born in London in 1967.
 He is the older brother of playwright and filmmaker Martin McDonagh.
Glassland is a 2014 Irish drama film written and directed by Gerard Barrett in his second feature following "Pilgrim Hill".
 The film stars Jack Reynor as a young man who tries to help his mother (Toni Collette) with her alcoholism.
Calvary is a 2014 Irish drama film written and directed by John Michael McDonagh.
 It stars Brendan Gleeson, Chris O'Dowd, Kelly Reilly, Aidan Gillen, Dylan Moran and Isaach de Bankolé.
 The film began production in September 2012 and was released in April 2014 in Ireland and the United Kingdom, in July in Australia and August 2014 in the United States.
 The film was screened at the 2014 Sundance Film Festival and at the 64th Berlin International Film Festival.
War on Everyone is a 2016 British black comedy buddy cop film written and directed by John Michael McDonagh.
 The film stars Alexander Skarsgård, Michael Peña, and Theo James.
 Set and filmed in Albuquerque, New Mexico, it was screened in the Panorama section of the 66th Berlin International Film Festival.
 The film was released in the United Kingdom and Ireland on 7 October 2016 through Icon Film Distribution.
Christopher O'Dowd (born 9 October 1979) is an Irish actor, best known for comedic roles such as Roy Trenneman in the Channel 4 comedy "The IT Crowd".
 O'Dowd created and starred in the Sky 1 television series "Moone Boy", which aired between 2012 and 2015.
 He had a recurring role on the comedy-drama series "Girls".
The Guard is a 2011 Irish buddy cop comedy film written and directed by John Michael McDonagh, starring Brendan Gleeson, Don Cheadle, Mark Strong and Liam Cunningham.
 It is the most successful independent Irish film of all time in terms of Irish box-office receipts, overtaking "The Wind that Shakes the Barley" (2006), which previously held this status.
Pauline McLynn (born 11 July 1962) is an Irish character actress and author.
 She is best known for her roles as Mrs Doyle in the Channel 4 sitcom "Father Ted", Libby Croker in the Channel 4 comedy drama "Shameless", and Yvonne Cotton in the BBC soap opera "EastEnders".
Ned Kelly is a 2003 Australian historical drama film based on Robert Drewe's 1991 novel "Our Sunshine".
 Directed by Gregor Jordan, the film's adapted screenplay was written by John Michael McDonagh.
 The film dramatises the life of Ned Kelly, a legendary bushranger and outlaw who was active mostly in Victoria, the colony of his birth.
 In the film, Kelly, his brother Dan, and two other associates—Steve Hart and Joe Byrne—form a gang of Irish Australians in response to Irish and English tensions that arose in 19th century Australia.
 Heath Ledger stars in the title role, with Orlando Bloom, Naomi Watts and Geoffrey Rush.
The Guarantee is a 2014 Irish drama film written and directed by Colin Murphy, and starring David Murray, Gary Lydon, Orla Fitzgerald, Morgan C. Jones and Peter Coonan.
 Directed by Ian Power, and based on Murphy's play of the same title, the film explores the events leading up to the Irish banking crisis, the title referring to a meeting of high-level officials that was held on 29 September 2008 and resulted in the Irish Government taking the decision to guarantee Ireland's entire domestic banking system.
 The film was produced by John Kelleher Media in association with the Broadcasting Authority of Ireland, the Irish Film Board and the commercial television channel TV3.
Patrick's Day is a 2014 Irish drama film written and directed by Terry McMahon.