The Lord Of The Rings, Behind The Scenes

Meanwhile, orcs sent by Sauron and Saruman kill Boromir and kidnap Merry and Pippin. Aragorn, Gimli and Legolas pursue the orcs into the kingdom of Rohan. Merry and Pippin escape when the orcs are slain by the Rohirrim. The hobbits flee into Fangorn forest, where they are befriended by the tree-like Ents. In Fangorn forest Aragorn, Gimli and Legolas find not the hobbits but Gandalf, resurrected after his battle with the Balrog and now the significantly more powerful "Gandalf the White". Gandalf assures them that Merry and Pippin are safe, and they travel instead to rouse Théoden, King of Rohan, from a stupor of despair inflicted by Saruman, and to aid the Rohirrim in a stand against Saruman's armies. Théoden fortifies himself at Helm's Deep along with Aragorn, Legolas, and Gimli while Gandalf rides off to gather more soldiers. Helm's Deep is besieged by Saruman's orcs, but Gandalf arrives with reinforcements, and the orcs are defeated.
The Ents attack Isengard, trapping Saruman in the tower of Orthanc. Gandalf, Théoden and the others arrive at Isengard to confront Saruman. Saruman refuses to acknowledge the error of his ways, however, and Gandalf strips him of his rank and most of his powers. Merry and Pippin rejoin the others and Pippin looks into a palantír, a seeing-stone that Sauron had used to communicate with Saruman, unknowingly leading Sauron to think that Saruman has captured the Ring-bearer, so Gandalf takes Pippin to Gondor.
On their way to Mordor, Frodo and Sam capture Gollum, who has been following them from Moria, and force him to guide them to Mordor. Finding Mordor's main gate impassable, they travel toward a pass known to Gollum. Gollum betrays Frodo by leading him to the great spider Shelob in the tunnels of Cirith Ungol. Frodo is left seemingly dead by Shelob's bite, but Sam fights her off. Sam takes the Ring, and forces himself to leave Frodo. Orcs find Frodo's body, and Sam learns that Frodo is not in fact dead, but unconscious. Frodo is carried to the tower of Cirith Ungol, and Sam determines to rescue him.
Sauron begins his military assault upon Gondor. Gandalf arrives at Minas Tirith in Gondor with Pippin, to alert Denethor of the impending attack. Minas Tirith is besieged, and Denethor, under the influence of Sauron through another palantír, loses hope and commits suicide. Aragorn, Legolas and Gimli come to Gondor by the Paths of the Dead, where Aragorn raises an undead army of oath-breakers in fulfilment of an old prophecy. The ghostly army help him to defeat the Corsairs of Umbar invading southern Gondor, and the forces freed from the south, along with Rohan's cavalry, help break the siege at Minas Tirith.