Question: What English actor portrays the ward taken in by Lord Eddard Stark in the HBO adaptation of the fantasy novel series "A Song of Ice and Fire"?

Context paragraphs:
List of Game of Thrones episodes: "Game of Thrones" is an American fantasy drama television series created by David Benioff and D. B. Weiss.  The series is based on the "A Song of Ice and Fire" novels by author George R. R. Martin.  The series takes place on the fictional continents of Westeros and Essos and chronicles the power struggles among noble families as they fight for control of the Iron Throne of the Seven Kingdoms.  The series starts when House Stark, led by Lord Eddard "Ned" Stark (Sean Bean) is drawn into schemes against King Robert Baratheon (Mark Addy) when the Hand of the King Jon Arryn (Robert's chief advisor) dies mysteriously.

Ned Stark: Eddard "Ned" Stark is a fictional character in the 1996 fantasy novel "A Game of Thrones" by George R. R. Martin, and the first season of "Game of Thrones", HBO's adaptation of Martin's "A Song of Ice and Fire" series.  In the storyline, Ned is the lord of Winterfell, an ancient fortress in the North of the fictional continent of Westeros.  Though the character is established as a primary character in the novel and the TV adaptation, Martin's plot twist at the end involving Ned shocked both readers of the book and viewers of the TV series.

Cripples, Bastards, and Broken Things: "Cripples, Bastards, and Broken Things" is the fourth episode of the HBO medieval fantasy television series "Game of Thrones", which first aired on May 8, 2011.  It was written by Bryan Cogman and directed by Brian Kirk.  In this episode Lord Eddard Stark, the new Hand of the King, investigates the sudden death of his predecessor.  Jon Snow, Eddard's bastard son, defends a new recruit who has just joined the rangers at "the Wall."  Exiled prince Viserys becomes increasingly frustrated as the Dothraki horde he needs to invade Westeros and win back his crown continues to linger at Vaes Dothrak.  The episode ends with Eddard's wife Catelyn arresting Tyrion Lannister on suspicion of attempting to murder her son Bran.

Church (Liverpool ward): Church is a Liverpool City Council Ward.  The population of this ward taken at the 2011 census was 13,974.  It contains part of the Mossley Hill area of Liverpool.  It includes the road Penny Lane, famous for the Beatles song of the same name.  The ward boundary was changed at the 2004 municipal elections to encompass parts of the former Grassendale and Allerton wards and losing part to the new Wavertree ward.

Arya Stark: Arya Stark is a fictional character in American author George R. R. Martin's award-winning "A Song of Ice and Fire" epic fantasy novel series.  She is a prominent point of view character in the novels, with the third most viewpoint chapters overall out of all the characters in the series so far, and is the only viewpoint character to appear in every published book of the series.

Theon Greyjoy: Theon Greyjoy is a fictional character in the "A Song of Ice and Fire" series of fantasy novels by American author George R. R. Martin, and its television adaptation "Game of Thrones".  Theon is the son and heir of Balon Greyjoy, taken as a ward by Lord Eddard Stark following Balon's failed rebellion.

Gate (novel series): Gate: Jieitai Kano Chi nite, Kaku Tatakaeri (Japanese: ゲート 自衛隊 彼の地にて、斯く戦えり , lit.  "Gate: Thus the Japanese Self-Defense Force Fought There!")  is a Japanese fantasy novel series written by Takumi Yanai and illustrated by Daisuke Izuka and Kurojishi from 2006 and later published by AlphaPolis.  A manga adaptation illustrated by Satoru Sao began in July 2011, and three spin-off manga began in 2015.  The first half of an anime television series adaptation aired from July to September 2015 and the second half aired from January to March 2016.  The series has been licensed by Sentai Filmworks in North America.  A sequel novel series, "Gate: Weigh Anchor", has been announced.

Petyr Baelish: Petyr Baelish, nicknamed Littlefinger, is a fictional character created by American author George R. R. Martin.  He is a prominent non-point of view character in Martin's "A Song of Ice and Fire" series, and a main character in HBO's adaptation of the series, "Game of Thrones", where he was portrayed by Aidan Gillen.  In "A Storm of Swords", it is revealed that several major plot points have hinged on Baelish's intrigues, including the framing of Tyrion Lannister for the attempt on Bran Stark's life, the downfall of Lord Eddard Stark, the deaths of Lord Jon Arryn and King Joffrey Baratheon, and the War of the Five Kings.

Alfie Allen: Alfie Allen (born 12 September 1986) is an English actor.  He is best known for portraying Theon Greyjoy in the HBO series "Game of Thrones" since 2011.

D.B. Weiss: Daniel Brett Weiss (born April 23, 1971) is an American television producer and writer, and novelist.  Along with his collaborator David Benioff, he is best known as co-creator and showrunner of "Game of Thrones", the HBO adaptation of George R. R. Martin's series of books "A Song of Ice and Fire".

Supporting paragraphs: Alfie Allen Theon Greyjoy
Answer: Alfie Allen