Question: What actor portrayed David Dunn in the American superhero thriller film "Unbreakable"?

Context paragraphs:
David Dunn (American football): David Dunn (born June 10, 1972) is a former American football wide receiver and return specialist in the National Football League.  He was drafted by the Cincinnati Bengals in the fifth round of the 1995 NFL Draft.  He played college football at Fresno State after transferring from Bakersfield Junior College.

Tiger Shroff: Tiger Shroff (born Jai Hemant Shroff; 2 March 1990) is an Indian film actor and martial artist who works in Hindi films.  Son of actor Jackie Shroff and producer Ayesha Dutt, he made his film debut with a leading role in the 2014 action comedy "Heropanti", which earned him a Filmfare Award for Best Male Debut nomination.  He next starred in the action drama "Baaghi" (2016), which earned over () worldwide, and received praise for the superhero thriller "A Flying Jatt" (2016).

Kix Brooks: Leon Eric "Kix" Brooks III (born May 12, 1955) is an American country music artist, actor, and film producer best known for being one half of the duo Brooks & Dunn and host of radio's "American Country Countdown".  Prior to the duo's foundation, he was a singer and songwriter, charting twice on Hot Country Songs and releasing an album for Capitol Records.  Brooks and Ronnie Dunn comprised Brooks & Dunn for 20 years, with both members beginning solo careers.  Brooks's solo career after Brooks & Dunn has included the album "New to This Town".

Unbreakable (film): Unbreakable is a 2000 American superhero thriller film written, produced, and directed by M. Night Shyamalan, and starring Bruce Willis and Samuel L. Jackson, alongside Robin Wright and Spencer Treat Clark.  The movie is the first installment in a trilogy.  In "Unbreakable", a security guard named David Dunn survives a horrific train crash.  After the incident, with the help of a manipulative disabled comic book shop owner named Elijah Price, he learns that he possesses superhuman powers.  As Dunn explores and reluctantly confronts his powers while trying to navigate a difficult family life, he begins to fight crime and learns the true nature of Elijah Price.

Superhero Movie: Superhero Movie is a 2008 American superhero comedy film written and directed by Craig Mazin, produced by Robert K. Weiss and David Zucker, and starring Drake Bell, Sara Paxton, Christopher McDonald, and Leslie Nielsen.  It was originally titled "Superhero!"  as a nod to one of the Zuckers' previous films, "Airplane! ", in which Nielsen also starred.

David Dunn (character): David Dunn is a fictional character and the main protagonist in the "Unbreakable" film series, portrayed by American actor Bruce Willis.  Dunn is a former college football prodigy and presently a security guard who discovers he has superhuman abilities.

Stephen Chase: Stephen Henry Chase was an American politician from Maine.  Chase, a Democrat from Fryeburg, represented Oxford County in the Maine Senate in 1845 and 1846.  Chase was Senate President in 1846 when he resigned.  He was replaced as Senate President by David Dunn.

David Dunn (politician): David Dunn (January 17, 1811February 17, 1894) was an American Democratic politician and lawyer.  He served as the 18th Governor of Maine in 1844.

M. Night Shyamalan: Manoj Nelliyattu "M. Night" Shyamalan ( ; ; "Maṉōj Nelliyāṭṭu Śyāmaḷaṉ"; Tamil: மனோஜ் நெல்லியட்டு ஷியாமளன் ; Malayalam: മനോജ് നെല്ലിയാട്ട് ശ്യാമളന്‍ born 6 August 1970) is an Indian American film director, screenwriter, author, producer, and actor known for making movies with contemporary supernatural plots and surprise endings.  His most well-received films include the supernatural horror thriller "The Sixth Sense" (1999), the superhero drama thriller "Unbreakable" (2000), and the science fiction thriller "Signs" (2002).  Afterwards, Shyamalan released a series of poorly received but sometimes financially successful movies, including the historical drama-horror film "The Village" (2004), the fantasy film "Lady in the Water" (2006), the disaster film "The Happening" (2008), the film adaptation of "The Last Airbender" (2010), and the science-fiction film "After Earth" (2013).  Following the financial failure of "After Earth," Shyalaman's career was revived with the release of the found footage horror "The Visit" (2015) and the psychological horror "Split" (2016), the latter of which is set in the same universe as his previous film "Unbreakable".  He is also known for producing "Devil" (2010), as well as being instrumental in the creation of the Fox science fiction series "Wayward Pines.

Iceberg (Banks novel): Iceberg is an original novel written by David Banks and based on the long-running British science fiction television series "Doctor Who".  It was number 18 (of 61) in the Virgin New Adventures range and featured the Cybermen, being a sequel to the serials "The Invasion" and "The Tenth Planet".  The events of the novel run concurrently with those of "Birthright".  Banks as an actor portrayed the Cyber Leader in several "Doctor Who" serials.  A prelude to the novel, also penned by Banks, appeared in "Doctor Who Magazine" #204.

Supporting paragraphs: Unbreakable (film) David Dunn (character)
Answer: Bruce Willis