The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
Gandalf, Legolas and Gimli have made it to Gondor. They must kill 60 uruk-hai. Then, they will save Merry and Éowyn from 2 uruk captains. Then, they will have to save them from the witch-king. Many uruk-hai will come until the witch-king is defeated, ending the level.
Any character can play once The Crack of Doom is completed.