Title: Théoden
Content:   In the 1981 BBC Radio 4 version of The Lord of the Rings, Théoden's death is described in song rather than dramatized conventionally; he is voiced by Jack May. In Ralph Bakshi's 1978 animated version of The Lord of the Rings, the voice of Théoden was provided by Philip Stone. Théoden also appears in Rankin/Bass's attempt to complete the story left unfinished by Bakshi in their television adaptation of The Return of the King, though he speaks little, and is voiced by Don Messick. His death is narrated by Gandalf (voiced by John Huston); in the animation, he is killed by a cloud, not by the Witch-king.  Théoden is an important character in Peter Jackson's Lord of the Rings film trilogy. The character, played by Bernard Hill, first appears in The Two Towers (2002). However, unlike in the books, the Lord of the Mark is actually possessed and prematurely aged by Saruman (Christopher Lee). Gandalf (Ian McKellen) releases him from the spell, instantly restoring him to his true age, after which Théoden banishes Gríma Wormtongue (Brad Dourif) from Edoras.
Title: Théoden
Content:  Théoden is a fictional character in J. R. R. Tolkien's fantasy novel, The Lord of the Rings. The King of Rohan and Lord of the Mark or of the Riddermark, names used by the Rohirrim for their land, he appears as a major supporting character in The Two Towers and The Return of the King. When first introduced, Théoden is weak with age and sorrow and the machinations of his top advisor, Gríma Wormtongue, and he does nothing as his kingdom is crumbling. Once roused by the wizard Gandalf, however, he becomes an instrumental ally in the war against Saruman and Sauron. Scholars have compared Théoden to Theodoric, King of the Visigoths, and Théoden's death in the Battle of the Pelennor Fields to Theodoric's in the Battle of the Catalaunian Fields. He has been contrasted, too, with another protagonist in The Lord of the Rings, Denethor Steward of Gondor; where Denethor is harsh, Théoden is open and welcoming.
Title: The Lord of the Rings (1978 film)
Content: Frodo – Christopher Guard ; Gandalf – William Squire ; Sam – Michael Scholes ; Aragorn – John Hurt ; Merry – Simon Chandler ; Pippin – Dominic Guard ; Bilbo – Norman Bird ; Boromir – Michael Graham Cox ; Legolas – Anthony Daniels ; Gimli – David Buck ; Gollum – Peter Woodthorpe ; Saruman – Fraser Kerr ; Théoden – Philip Stone ; Wormtongue – Michael Deacon ; Elrond – André Morell ; Innkeeper – Alan Tilvern ; Galadriel – Annette Crosbie ; Treebeard – John Westbrook The cast of the film was:  This primary cast was supported by a large cast of animation doubles, who were not credited on screen; the matter went to guild arbitration.
Title: Bernard Hill
Content:  more sought-after for more prominent parts. Hill played Philos in The Scorpion King (2002), starring Dwayne "The Rock" Johnson, Michael Clarke Duncan and Kelly Hu. Hill became known to a worldwide audience when he was cast in the role of King Théoden of Rohan in Peter Jackson's The Lord of the Rings film trilogy based on Tolkien's novel of the same name. Before casting him as King Théoden, director Peter Jackson considered Hill for the part of Gandalf. When he was due to leave the set at the end of production, Jackson gave Hill two gifts, Théoden's helmet and sword Herugrim. At the 2006 BAFTA TV 
Title: Théoden
Content:  Théoden is introduced in The Two Towers, the second volume of The Lord of the Rings, as King of Rohan. By this point Théoden had grown weak with age, and was largely controlled by his chief advisor Gríma Wormtongue, who was secretly in the employ of the corrupt wizard Saruman. One of the last Hunt for the Ring manuscripts says Wormtongue has "great influence over the king", who is "enthralled by his counsel". In Unfinished Tales, it is further implied that the failure of the king's health was "...induced or increased by subtle poisons, administered by Gríma". As Théoden sat powerless, Rohan was troubled by Orcs and Dunlendings, 
Title: The Lord of the Rings: The Two Towers
Content:  Frodo on his quest. ; Billy Boyd as Peregrin Took: Better known as Pippin, a hobbit mistakenly captured by the Uruk-hai. ; Dominic Monaghan as Meriadoc Brandybuck: Better known as Merry, a distant cousin of Frodo's who is mistakenly captured along with Pippin by the Uruk-hai. ; John Rhys-Davies as Gimli: A dwarf warrior and one of Aragorn's companions. ; Also voices Treebeard: The leader of the ents, who is roused to anger after seeing that Saruman had decimated a large part of Fangorn Forest. ; Orlando Bloom as Legolas Greenleaf: An elven archer and one of Aragorn's companions. ; Bernard Hill as Théoden: The King of Rohan, who 
Title: The Lord of the Rings (1981 radio series)
Content: Narrator (UK version): Gerard Murphy ; Narrator (American version): Tammy Grimes ; Frodo Baggins: Ian Holm ; Gandalf the Grey/Gandalf the White: Michael Hordern ; Aragorn (Strider): Robert Stephens ; Sam Gamgee: Bill Nighy (credited as William Nighy) ; Meriadoc Brandybuck (Merry): Richard O'Callaghan ; Peregrin Took (Pippin): John McAndrew ; Legolas: David Collings ; Gimli: Douglas Livingstone ; Boromir: Michael Graham Cox ; Galadriel: Marian Diamond ; Celeborn: Simon Cadell ; Arwen Evenstar: Sonia Fraser ; Saruman the White: Peter Howell ; Elrond: Hugh Dickson ; Bilbo Baggins: John Le Mesurier ; Gollum/Sméagol: Peter Woodthorpe ; Théoden: Jack May ; Gríma Wormtongue: Paul Brooke ; Éowyn: Elin 
Title: The Lord of the Rings (film series)
Content:  Day-Lewis was approached for the part numerous times, although Jackson eventually inquired about him. Jackson cast Stuart Townsend, whom the studio deemed too young. After shooting began, Jackson agreed and decided to recast the role. They approached Viggo Mortensen, but also spoke to Russell Crowe (who auditioned for Boromir previously), as a backup choice. Patrick McGoohan, their first choice for Denethor, proved "quite grumpy" when they met, and they instead looked into Donald Sutherland and John Rhys-Davies, and ultimately cast John Noble. Davies was recast as Gimli, instead of Billy Connolly (later cast as Dain), Robert Trebor and Timothy Spall. In conversations with Miramax, Liam Neeson's name came up for Boromir, but he declined. Daniel Craig auditioned. New Line suggested Nicolas Cage, but the filmmakers declined and cast Sean Bean.
Title: The Lord of the Rings: The Return of the King
Content: Elijah Wood as Frodo Baggins: A young hobbit who continues his quest to destroy the Ring, which continues to torture him. ; Ian McKellen as Gandalf the White: An Istari wizard who travels to aid the Men of Gondor, acting as a general at the Siege of Gondor. ; Viggo Mortensen as Aragorn Elessar: A Dúnedain ranger who must finally face his destiny as King of Gondor. ; Sean Astin as Samwise Gamgee: Better known as Sam, Frodo's loyal hobbit gardener and companion. ; Andy Serkis as Sméagol Trahald / Gollum: A wretched and treacherous creature who was once one of the river-folk (an extinct race 
Title: The Lord of the Rings (film series)
Content:  Connery for the part (both declined), and put a veto against Richard Harris when his name came up. When von Sydow inquired for the part later, his agent told him they were looking for an English actor. While casting, Jackson looked for backup options for the various parts, including Lucy Lawless and Nicole Kidman for Galadriel; Anthony Hopkins or Sylvester McCoy (eventually recast as Radagast) for Bilbo; Paul Scofield, Jeremy Irons, Malcolm McDowell or Tim Curry for Saruman. For Gandalf, they looked into Tom Baker, Tom Wilkinson, Sam Neil, Bernard Hill (who was instead cast as Theoden) and Peter O'Toole, and into several older actors who auditioned for other parts, such as Patrick McGoohan and Anthony Hopkins. Miramax and Jackson discussed Sir Daniel Day-Lewis for Aragorn, starting "fanciful internet speculation" 

Question: who played king theoden in lord of the rings?
Answer: Bernard Hill.