This first third of Tolkien's saga shows how a young, distinctly unheroic hobbit called Frodo Baggins (wonderfully played, with a near-perfect English accent, by the young American star Elijah Wood) comes into possession of a ring, reluctantly passed on to him by his uncle Bilbo (Ian Holm). The ring can make its wearer invisible, but also has the potential to wreak universal havoc (it has been likened by some commentators to the nuclear bomb).