Who plays Théoden in The Lord of the Rings: The Return of the King?

Théoden is played by Bernard Hill.

What are Théoden's abilities?

Théoden's abilities include leadership, horsemanship, combat, inspiration.

Théoden has 3 mapped relationships in The Lord of the Rings: The Return of the King. Explore the interactive relationship map for details.

Occupation: monarch. Manner of Death: Death in battle.

Morwen Steelsheen (Mother). Thengel (Father). Théodred (Child). Théodwyn (Sibling). Elfhild (Spouse). Sauron (Enemy). Saruman (Enemy).

King of Rohan who overcomes manipulation to lead his people.

Théoden — Alliance War Ally — Aragorn (Viggo Mortensen)
They unite their forces against the Orc army.

Aragorn travels with Théoden to Isengard, and Théoden later brings Rohan's army to Gondor's aid.
Théoden — Alliance Military Ally — Gandalf (Ian McKellen)
Their coordinated leadership links Gondor's and Rohan's defenses.

Gandalf accompanies Théoden during the return to Edoras and later marshals Minas Tirith's defenders while Théoden leads Rohan's charge.
Théoden — Family Uncle And Niece — Éowyn (Miranda Otto)
Their family bond gives the battlefield loss personal weight.

Éowyn is identified as Théoden's niece and is present when he is mortally wounded and dies in her arms.

Related entry on Wikidata (Q308813), public domain (CC0).