The continuing quest of Frodo (Elijah Wood) and the Fellowship to destroy the One Ring. Frodo and Sam (Sean Astin) discover they are being followed by the mysterious Gollum. Aragorn (Viggo Mortensen), the Elf archer Legolas and Gimli the Dwarf encounter the besieged Rohan kingdom, whose once great King Theoden has fallen under Saruman's deadly spell.