Dark Kingdom: The Dragon King (also known as "Ring of the Nibelungs", "Die Nibelungen"," Curse of the Ring" and "Sword of Xanten") is a 2004 German television film directed by Uli Edel and starring Benno Fürmann, Alicia Witt, Kristanna Loken and Max von Sydow.
 The film is based on the Norse mythology story "Völsungasaga" and the German epic poem "Nibelungenlied", which tells the mythological story of Siegfried the Dragon-Slayer.
 Richard Wagner's music dramas "Siegfried" and "Götterdämmerung" are based on the same material.
 "Dark Kingdom: The Dragon King" was written by the husband and wife team of Diane Duane and Peter Morwood and is a Tandem Communications production.
 It was filmed entirely in South Africa.
Wilhelm Richard Wagner ( ; ] ; 22 May 181313 February 1883) was a German composer, theatre director, polemicist, and conductor who is primarily known for his operas (or, as some of his later works were later known, "music dramas").
 Unlike most opera composers, Wagner wrote both the libretto and the music for each of his stage works.
 Initially establishing his reputation as a composer of works in the romantic vein of Weber and Meyerbeer, Wagner revolutionised opera through his concept of the "Gesamtkunstwerk" ("total work of art"), by which he sought to synthesise the poetic, visual, musical and dramatic arts, with music subsidiary to drama.
 He described this vision in a series of essays published between 1849 and 1852.
 Wagner realised these ideas most fully in the first half of the four-opera cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").
Der Ring des Nibelungen (The Ring of the Nibelung), WWV 86, is a cycle of four German-language epic music dramas composed by Richard Wagner.
 The works are based loosely on characters from the Norse sagas and the "Nibelungenlied".
 The composer termed the cycle a "Bühnenfestspiel" (stage festival play), structured in three days preceded by a " " ("preliminary evening").
 It is often referred to as the Ring Cycle, "Wagner's Ring", or simply "The Ring".
Georg Unger (1837 – 1887) was a German tenor most famous for playing Siegfried in "Der Ring des Nibelungen" written by Richard Wagner.
Siegfried, WWV 86C, is the third of the four music dramas that constitute "Der Ring des Nibelungen" ("The Ring of the Nibelung"), by Richard Wagner.
 It premiered at the Bayreuth Festspielhaus on 16 August 1876, as part of the first complete performance of "The Ring" cycle.
Jay Hunter Morris (born July 3, 1963) is an American operatic tenor.
 He is best known internationally for the role of Siegfried in the Metropolitan Opera's 2011–12 series of Wagner's "Ring Cycle", performances of which were cinecast and radio broadcast live worldwide, aired on U.S. television, and released on DVD.
Pappano's Essential Ring Cycle is a British television documentary first aired on BBC Four in 2013 presented by the Italian conductor Antonio Pappano about the German composer Richard Wagner and his tetralogical opera The Ring Cycle, also called by the formal title of "Ring of the Niebelung".
 In 90 minutes he covers all 4 operas consisting of Wagner's Ring Cycle with scenes taken from his productions of the operas.
Lars Cleveman (born 16 June 1958) is a Swedish musician and opera singer.
 Together with Martin Rössel, he founded Sweden's first electronic underground group, Dom Dummaste.
 Additionally, Cleveman is a tenor opera singer, performing at the Royal Swedish Opera in Stockholm.
 He made his début at Covent Garden in 2009 as Tristan in Tristan und Isolde replacing an indisposed Ben Heppner and subsequently also sang at Bayreuther Festspiele during 2011.
 In May 2013, Cleveman made his début at the Metropolitan Opera singing the role of Siegfried in the third of three performances of Wagner's Ring Cycle.
Tieste Wilmant (1859-1937) was an Italian operatic baritone.
 He made his professional opera debut in 1878 in Chiari.
 In 1896 he originated the role of Marcello in the original production of Giacomo Puccini's "La bohème" at the Teatro Regio Torino in 1896.
 He made his debut at La Scala in the 1893-1894 season where he appeared in productions of Alfredo Catalani's "Loreley" and in Puccini's "Manon Lescaut".
 He appeared in performances at La Scala several more times over the next decade including portraying the role of Alberich in the Italy's first performance of Richard Wagner's "Siegfried" and the role of Iago in Verdi's "Otello".
 Wilmant made four records on the Zonophone record label in 1904.
Georg Unger Vetlesen (January 31, 1889 – March 24, 1955) was a Norwegian shipbuilder and naturalized American philanthropist.

Question: Georg Unger played the role of Siegfried in which cycle of four Wagner dramas?
Answer: Der Ring des Nibelungen