Question: What was the feature film debut of the man who starred alongside Barry Keoghan and Brendan Gleeson in the movie "Trespass Against Us"?
Context: Dunkirk is a 2017 war film written, co-produced, and directed by Christopher Nolan that portrays the Dunkirk evacuation of the Second World War.  Its ensemble cast includes Fionn Whitehead, Tom Glynn-Carney, Jack Lowden, Harry Styles, Aneurin Barnard, James D'Arcy, Barry Keoghan, Kenneth Branagh, Cillian Murphy, Mark Rylance, and Tom Hardy.  Distributed by Warner Bros.  Pictures, the film is a co-production between the United Kingdom, the United States, France, and the Netherlands. Trespass Against Us is a British-American crime drama film directed by Adam Smith and written by Alastair Siddons.  The film stars Michael Fassbender, Brendan Gleeson, Sean Harris, Lyndsey Marshal, Rory Kinnear, and Killian Scott. Barry Keoghan (born 18 October 1992) is an Irish actor.  He has appeared in the films "Dunkirk" along with Mark Rylance, Tom Hardy, Cillian Murphy, Kenneth Branagh, Tom Glynn-Carney; "The Killing of a Sacred Deer" with Nicole Kidman, Colin Farrell and Alicia Silverstone; and "Trespass Against Us" with Michael Fassbender and Brendan Gleeson.  He has also played the "heartless cat killer" Wayne in the RTÉ drama "Love/Hate". Domhnall Gleeson ( ; born 12 May 1983) is an Irish actor and writer.  He is the son of actor Brendan Gleeson, alongside whom he has appeared in several films and theatre projects.  He received a Bachelor of Arts in Media Arts from Dublin Institute of Technology. Pursuit is a 2015 Irish crime thriller film written and directed by Paul Mercier.  The film stars Ruth Bradley, Barry Ward, Liam Cunningham and Brendan Gleeson among an ensemble cast of Irish actors. Alone in Berlin is a 2016 war drama film directed by Vincent Pérez and written by Pérez and Achim von Borries, based on the 1947 fictionalized novel "Every Man Dies Alone" by Hans Fallada.  The novel's characters Otto and Anna Quangel are based on the real lives of Otto and Elise Hampel.  When their son dies in France, the couple start writing postcards to urge people to protest against Adolf Hitler and the Nazi regime.  The film stars Emma Thompson, Brendan Gleeson, and Daniel Brühl.  Principal photography began on 27 March 2015 in Berlin.  It was selected to compete for the Golden Bear at the 66th Berlin International Film Festival. Michael Fassbender (born 2 April 1977) is an Irish actor.  His feature film debut was in the fantasy war epic "300" (2007) as a Spartan warrior; his earlier roles included various stage productions, as well as starring roles on television such as in the HBO miniseries "Band of Brothers" (2001) and the Sky One fantasy drama "Hex" (2004–05).  He first came to prominence for his role as IRA activist Bobby Sands in "Hunger" (2008), for which he won a British Independent Film Award.  Subsequent roles include in the independent film "Fish Tank" (2009), as a Royal Marines lieutenant in "Inglourious Basterds" (2009), as Edward Rochester in the 2011 film adaptation of "Jane Eyre", as Carl Jung in "A Dangerous Method" (2011), as the sentient android David 8 in "Prometheus" (2012) and its sequel, "" (2017), and in the musical comedy-drama "Frank" (2014) as an eccentric musician loosely inspired by Frank Sidebottom. The Tailor of Panama is a 2001 Irish-American spy thriller film directed by John Boorman and starring Pierce Brosnan and Geoffrey Rush.  Jamie Lee Curtis, Brendan Gleeson, Daniel Radcliffe in his feature film debut, Catherine McCormack, and Harold Pinter appear in supporting roles. The Snapper is a 1993 Irish television film which was directed by Stephen Frears and starred Tina Kellegher, Colm Meaney and Brendan Gleeson.  The film is based on the novel by Irish writer Roddy Doyle, about the Rabbitte family and their domestic adventures.  For his performance, Meaney was nominated for the Golden Globe Award for Best Actor – Motion Picture Musical or Comedy. John Robert Magaro (born February 16, 1983) is an American film, television and stage actor.  He starred alongside James Gandolfini in "Not Fade Away" (2012) — the feature film debut of David Chase, creator of "The Sopranos".  He also starred alongside Rooney Mara in "Carol" (2015).  He made his Broadway debut as Earl Williams, the escaped convict, in the hit revival of The Front Page in 2016.
Answer: 300