Having fled the shire in their escape from Sauron's Dark Riders, Frodo and the Fellowship of the Ring have journeyed to Rivenndell and beyond, Their mission is to reach the Mountain of Fire in Mordor, where the Ruling Ring can be destroyed, but already their campaign is in jeopardy.

Gandalf has fallen into an abyss, and Boromir has fatally succumbed to the power of the Ring. The others are beseiged by an army of orks - save for Frodo and Sam, whose journey down the River Anduin is being watched by a dark and shadowy figure. . .