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The brand-new, full trailer for Peter Jackson's The Hobbit: An Unexpected Journey has arrived – just in time for Hobbit Day (on Bilbo and Frodo Baggins' mutual birthday, September 22)! I'll bet you didn't know a Hobbit Day existed, much less a Tolkien Week…. Well, now you know.

Video: New 'Hobbit' Production Diary Footage

The long-awaited big-screen adaptation of J.R.R. Tolkien's Middle-earth fantasy adventure follows the adventures of the diminutive Hobbit Bilbo Baggins (played by Martin Freeman) as he journeys with a group of 13 Dwarves to reclaim the lost Dwarf Kingdom of Erebor from the fearsome dragon Smaug. On the way, they must battle treacherous Goblins and Orcs, deadly Wargs and sly Sorcerers. And when Bilbo gains possession of Gollum's (the returning Andy Serkis) "precious" ring, the fate of Middle-earth hangs in the balance.

Fans can go to www.TheHobbit.com to catch four additional endings to the new trailer and choose their favorite to create their own version of the trailer to share with friends. Preciousssss...

The epic film also features returning The Lord of the Rings cast members Ian McKellen, Cate Blanchett, Ian Holm, Christopher Lee, Hugo Weaving and Elijah Wood. Other cast members include Richard Armitage, Manu Bennett, Jed Brophy, Adam Brown, John Callen, Mark Hadlow, Peter Hambleton, Barry Humphries, Stephen Hunter, William Kircher, Sylvester McCoy, Bret McKenzie, Graham McTavish, James Nesbitt, Dean O'Gorman, Conan Stevens, Ken Stott and Aidan Turner.

Video: Go Behind the Scenes of 'The Hobbit'

The Hobbit: An Unexpected Journey rides into theaters in 3D and 2D in select theaters and IMAX on December 14. The Hobbit: The Desolation of Smaug will be released Dec. 13, 2013; while the third installment in the series, The Hobbit: There and Back Again, will hit theaters July 18, 2014.