The end of the end:
Frodo has been captured after his battle with Gollum and the giant spider, Shelob, but Sam fights on, rescuing Frodo from Cirith Ungol after the two factions of orcs fight over Frodos methril shirt. With the immediate danger out of the way Frodo and Sam leave the tower and head into Mordor only to see the vast ocean of orcs and other evil creatures under the control and view of the Great Eye.
Meanwhile Aragon, Legolas, Gimli and the Dead Men of Dunharrow are on their way to Minas Tirith to aid in the war. Gandalf and Pippin are within the inner city attempting to save Faramir from his father the Steward of Gondor who has gone mad and is trying to burn Faramir alive. The Rohan army, with Merry and Lady Éowyn amongst the soldiers, are fighting a losing battle against the forces of Mordor. Eowyn defeats the Witch King after he fatally injures her uncle, King Theoden, with the help of Merry. However both Merry and Eowyn are hurt in the fight. The battle seems lost when Aragon and co arrive, the undead mean of Dunharrow destroy the enemy. with the battle won Gandalf turns his attention to Frodo. Aragon proposes a distraction to draw out the armies of Mordor allowing Frodo safe passage to Mount Doom to destroy the ring. Aragon leadds a small army to the black gates and summons the armies of Mordor to come out and fight. Aragon makes an emotional battle speech and the final fight begins - for Frodo and Middle Earth. The great eagles come to fight the flying nazgul.
With the armies moving out, Frodo and Sam make their way to Mount Doom however with no food and little water they expect they will not be returning. Frodo, so exahusted from bearing the ring, collapses leaving Sam to carry Frodo up the mountain. However Gollum has not given up and makes a last attempt at stealing back his precious. Frodo runs into the door to the volcano but with Sam onlooking decides to keep the ring as his own. Alas all is not lost as Gollum jumps on Frodo biting off the finger with the ring. In the struggle both Frodo and Gollum (holding the ring) fall off the ledge. Gollum is destroyed in the lava but Frodo is hanging on. Sam runs to Frodo and pulls him up just as the ring is destroyed and the volcano explodes. Sam and Frodo are trapped on a large rock with lava and all hope for them is gone as Middle Earth is saved. The Great Eye crumbles and the floor opens, engulfing many of the army of Mordor (the rest run away) but Aragon and the men are safe. Gandalf calls on his allies and the great eagles fly to Frodo and Sam.
With the ring destroyed and the Steward of Gondor defeated, Aragon steps up and is crowned as King of Gondor with Ewin, who has stayed behind, as his Queen. Also Eowyn and Faramir get together holla!! The four hobbits are honored at the coronation before returning back to the shire where everyone is none the wiser to the events of the last years. Sam finally follows his heart and asks Rosie to dance - skip to the wedding. A year on Frodo and the other hobbits travel with Gandalf and Bilbo to the sea to say goodbye to Gandalf, Bilbo and the last few elves including Elrond and Galadrial who are leaving for the undying lands. However the hobbits are devastated to learn Frodo plans to leave with them. A tearful goodbye follows and Frodo gives Sam Bilbo's book, whithin it "a hobbit's tale" by Bilbo and "the lord of the rings" by Frodo, and there is space enough for Sam to have more adventures. The 3 hobbits return home and the film ends with Sam returning home to his wife and two children - happy and safe.