Gandalf the Grey gives his life in battle against the Balrog, giving the Fellowship of the Ring time to escape from the Mines of Moria. Weeks later, Frodo Baggins and Samwise Gamgee continue their journey to Mordor to destroy the One Ring and, with it, the Dark Lord Sauron. One night, they are attacked by the ring's former owner Gollum. The pair capture Gollum, but Frodo takes pity on him, understanding the burden of the Ring. Frodo persuades Gollum to guide them to Mordor. Sam immediately distrusts Gollum on sight and warns Frodo that Gollum will betray them. In Rohan, Aragorn, Legolas and Gimli pursue the Uruk-hai who have taken Merry and Pippin prisoner. Meanwhile, Rohan's King Théoden has been entranced by Gríma Wormtongue, who is secretly in the service of Saruman the White. Saruman has his Orcs and Wild Men of Dunland lay siege to the lands. Théoden's nephew Éomer accuses Gríma of being a spy; Gríma has him banished for undermining him. Éomer travels to the countryside to gather the remaining men of the Rohirrim. Éomer's army later ambush and kill the Uruk-hai holding Merry and Pippin. Merry and Pippin flee into Fangorn forest and meet Treebeard, the oldest of the Ents.