Question: Colonel Walter E. Kurtz,is a fictional character and the main antagonist of Francis Ford Coppola's film "Apocalypse Now" (1979), and portrayed by which American actor, film director and political activist?

Context paragraphs:
Colonel Kurtz: Colonel Walter E. Kurtz, portrayed by Marlon Brando, is a fictional character and the main antagonist of Francis Ford Coppola's film "Apocalypse Now" (1979).  Colonel Kurtz is based on the character of a nineteenth-century ivory trader, also called Kurtz, from the novella "Heart of Darkness" (1899) by Joseph Conrad.

Anton Coppola: Antonio Coppola (born March 21, 1917) is an American opera conductor and composer.  He is the uncle of film director Francis Ford Coppola and actress Talia Shire, as well as the grand-uncle of Nicolas Cage, Sofia Coppola, Gian-Carlo Coppola, Jason Schwartzman and Robert Schwartzman, and is the younger brother of American composer and musician Carmine Coppola.

Anthony Corleone: Anthony Vito "Tony" Corleone is a fictional character in "The Godfather" trilogy of films directed by Francis Ford Coppola.  He is portrayed by Anthony Gounaris in the first film, James Gounaris in the second, and singer Franc D'Ambrosio in the third.  The character was given the name Anthony because it was thought that the three-year-old Gounaris of the first film would respond best if his own name was used.  He is the son of Michael (Al Pacino) and Kay Corleone (Diane Keaton), and the older brother of Mary Corleone (Sofia Coppola).  While Anthony was never a major character in the first two films, major events in his life were the backdrop of key parts of the second film, and his relationship with his father is a plot point in the third film.  He was not mentioned by name in the novel.

Apocalypse Now Redux: Apocalypse Now Redux is a 2001 extended version of Francis Ford Coppola's epic war film "Apocalypse Now", which was originally released in 1979.  Coppola, along with editor/long-time collaborator Walter Murch, added 49 minutes of scenes that had been cut out of the original film.  It represents a significant reedit of the original version.

Apocalypse Now (painting): Apocalypse Now is a 1988 painting by the American artist Christopher Wool, widely regarded as among the most important of his "word paintings" created in the late 1980s.  It consists of the words "SELL THE HOUSE SELL THE CAR SELL THE KIDS", stenciled in black, block letters in alkyd enamel on an off-white painted aluminum and steel plate measuring 84 x 72 inches (213.4 x 182.9 cm).  The quotation is from the 1979 Francis Ford Coppola movie "Apocalypse Now", where it is written in a letter mailed home by a character who has lost his mind in the jungle.

Gia Coppola: Gian-Carla "Gia" Coppola (born January 1, 1987) is an American film director, screenwriter, and actress.  She is a granddaughter of Francis Ford Coppola, the daughter of Gian-Carlo Coppola and the niece of Roman Coppola and Sofia Coppola.

Marlon Brando: Marlon Brando Jr. (April 3, 1924 – July 1, 2004) was an American actor, film director and political activist.  He is widely credited with bringing realism to film acting.  He helped to popularize the Stanislavski system of acting, studying with Stella Adler in the 1940s.  Brando is widely known for his Academy Award-winning performances as Terry Malloy in "On the Waterfront" (1954) and Vito Corleone in "The Godfather" (1972), as well as his performances in "A Streetcar Named Desire" (1951), "Viva Zapata! " (1952), "Julius Caesar" (1953), "The Wild One" (1953), "Guys and Dolls" (1955), "Sayonara" (1957), "Last Tango in Paris" (1972), and "Apocalypse Now" (1979).  Brando was also an activist for many causes, notably the Civil Rights Movement and various Native American movements.

Francis Ford Coppola Presents: Francis Ford Coppola Presents is a lifestyle brand created by Francis Ford Coppola, under which he markets goods from companies he owns or controls.  It includes films and videos, resorts, cafes, a literary magazine and a winery.

Hearts of Darkness: A Filmmaker's Apocalypse: Hearts of Darkness: A Filmmaker's Apocalypse is a 1991 documentary film about the production of the 1979 epic Vietnam War feature film "Apocalypse Now".  The original movie which the documentary is about was directed by Francis Ford Coppola and starred Marlon Brando, Martin Sheen, and Robert Duvall.

Apocalypse Now: Apocalypse Now is a 1979 American epic war film directed, produced, and co-written by Francis Ford Coppola.  It was co-written by John Milius with narration written by Michael Herr.  It stars Marlon Brando, Robert Duvall, Martin Sheen, Frederic Forrest, Albert Hall, Sam Bottoms, Larry Fishburne, and Dennis Hopper.  The screenplay, written by Milius, adapts the story of Joseph Conrad's novella "Heart of Darkness", changing its setting from late nineteenth-century Congo to the Vietnam War.  It draws from Herr's "Dispatches" and Werner Herzog's "Aguirre, the Wrath of God" (1972).  The film revolves around Captain Benjamin L. Willard (Sheen) on a secret mission to assassinate Colonel Kurtz, a renegade who is presumed insane.

Supporting paragraphs: Colonel Kurtz Marlon Brando
Answer: Marlon Brando