Many years before The Hobbit, the great Dwarven kingdom of the Lonely Mountain, Erebor, ruled by King Thrór, is overtaken with all its treasure by the evil dragon Smaug, and the dwarves of the mountain are robbed of their homeland.
60 years later, a peaceful hobbit of the Shire, Bilbo Baggins is visited by the great wizard Gandalf and a company of thirteen dwarves- Balin, Dwalin, Óin, Glóin, Bifur, Bofur, Bombur, Kíli, Fíli, Ori, Nori, Dori, and Thorin Oakenshield, grandson of Thror and heir to the throne of the mountain. They have a plot to retake Erebor from Smaug, and want to hire Bilbo as their burglar (as Gandalf states that hobbits are light on their feet and have chance to be unnoticed by the dragon). Though first feeling uneasy, Bilbo reluctantly agrees, and the company starts it's journey from Bilbo's hobbit-hole, Bag End.
As they travel through the Shire, Balin tells Bilbo the story of Thorin, where he, Thorin, and Dwalin fought Azog at the Battle of Azanulbizar, where Thrór, Thorin's grandfather, was slain by Azog, the pale Orc, whom Thorin duelled and defeated, severing his hand and bringing victory to the dwarf people, reconquering Moria. However, many of the dwarves had died during the battle, and with Thorin's father missing, Thorin became the new King of the Dwarves under the Mountain. One night the company encounters three hungry trolls, Tom, Bert and William, who capture Bilbo and the dwarves (Gandalf dissapears that night), and try to eat them. However, Bilbo manages to play for time long enough for Gandalf to arrive at dawn, when the sun shines on the trolls, turning them to stone. Once free, the company finds the trolls' cave, where they get swords- Thorin claims Orcrist, the Goblin-cleaver, Gandalf finds Glamdring, the Foe-hammer, and Bilbo gets Sting, a small elvish sword, which glows blue if orcs or goblins are near. Bilbo and the dwarves then meet Radagast the Brown, a queer wizard living in Mirkwood- he gives Gandalf a Morgul-blade, which he believes belongs to the Witch-King of Angmar, and he found in the old fortress, Dol Guldur. He also tells Gandalf that he thinks the Dark Lord Sauron is emerging again. Fleeing orc-riders led by Yazneg and Fimbul, who they escape with the help of Radagast, the company eventually reaches the hidden valley of Imladris, also known as Rivendell, the Last Homely House east of the Sea.
There, they achieve a warm welcome from Elrond, the wise elven lord of Rivendell. They are given food (which they do not enjoy) and shelter, and Elrond also helps them by discovering a riddle on their old map of Erebor, which reveals the location of the hidden door that leads into the mountain. As Bilbo and the dwarves unexpectedly leave Rivendell and start their long and dangerous journey through the Misty Mountains, Gandalf shows the White Council, a council of elven rulers and wizards, the Morgul blade and Radagasts' suspicion that Sauron is regaining power, but Saruman, leader of the council, ignores his statements. Meanwhile, it is revealed that Azog, a brutal orc enemy of Thorin, who was thought to be dead, was the one who sent the orcs to kill them. He kills Yazneg for his mistake and places a bounty on Thorin's head.
Meanwhile, Bilbo and the dwarves, fleeing from aggressive stone-giants, are captured by evil goblins of Goblin Town in the mountains. Bilbo accidentally falls into a hole while fighting with a goblin, but the dwarves are brought before the Great Goblin, the tyrannical ruler of Goblin Town. He first attempts to give the company to Azog and his minions for the bounty, but when seeing Thorin's sword, the Goblin-cleaver, he is drove into such a rage, that he orders the execution of the dwarves. However, Gandalf arrives in the nick of time, frees the dwarves and they all escape Goblin Town after a cat-and-mouse chase, with Gandalf killing the Great Goblin.
Meanwhile, Bilbo finds himself on the shore of an underground lake, and finds a golden ring, not knowing that it is actually the great One Ring itself. He then encounters a strange, slimy creature called Gollum. Gollum wants to eat Bilbo, while Bilbo wants Gollum to help him find his way out. So the two start a riddle game- if Gollum wins, he eats Bilbo, but if the hobbit wins, he shows him the way out. As Bilbo is about to ask his final riddle, he suddenly doesn't remember any. He puts his hand in his pocket, and, finding the ring, asks himself- "What have I got in my pocket?". Gollum thinks it is a riddle and cannot answer- he thus loses the game. However, Gollum then discovers that he has lost his precious- the ring Bilbo had found. Realizing that Bilbo took it, he attacks the poor hobbit, who accidentally puts on the Ring, and finds that it makes him invisible. Following an outraged Gollum to the gate of the mountain, he jumps over the wretched creature (not killing him out of pity), and escapes the mountain.
Soon he is reunited with Gandalf and the dwarves, who have escaped from the mountain as well. However, just when becoming relieved of passing over the Misty Mountains, the company is attacked by Azog and his orc soldiers, riding on wargs, evil wolf-like beasts. They climb on trees to save themselves, throwing flaming pine-cones at the wargs. As the trees collapse under the weight of the dwarves, Thorin duels Azog to save the company. He is defeated but saved by Bilbo. With the wargs about to kill them, the great eagles arrive and save the company from the evil orcs, carrying them away to safety. They are put down on a huge rock, the Carrock, at the edge of their next peril- Mirkwood...
- 79000 Riddles for the Ring
- 79001 Escape from Mirkwood Spiders
- 79002 Attack of the Wargs
- 79003 An Unexpected Gathering
- 79004 Barrel Escape
- 79010 The Goblin King Battle
- 30213 Gandalf at Dol Guldur
- 30212 Mirkwood Elf Guard
- Each minifigure in the theme only appears in one set, with the exception of Bilbo Baggins, Gandalf and Gollum.
- The Target exclusive of The Hobbit: An Unexpected Journey Blu-ray comes with a featurette on the making of the LEGO sets based on the first film and a Bilbo Baggins minifigure. This variant features the blue coat that was seen in the trailer and extended edition of the movie.
- Bilbo's Good Morning Bilbo Baggins! variant appears as a pre-order exclusive for LEGO The Hobbit: The Video Game.