The next two episodes, The Two Towers and The Return of the King, will follow over the next two years.
Together, they tell the story of young Frodo the hobbit, who joins a wise wizard, Gandalf, to save the world from a powerful ring which has fallen into evil hands.
We've seen it already!
It's already had rave reviews from critics, and CBBC Newsround Online also caught a sneaky preview before the premiere.
We can reveal that The Fellowship of the Ring is a cracking movie, full of thrills and adventure. Hold onto your seats though, there are some well scary moments.
It's now set for a magical battle with rival movie and record-breaker Harry Potter..