Beowulf and The 13th Warrior

Beowulf fighting the Dragon

We have finished reading the poem Beowulf and we have finished watching the first of the two movies: The 13th Warrior and Beowulf and Grendel.  How exactly is The 13th Warrior a rendition of the poem Beowulf?  Are there similarities to the story line?  Differences?  How are the characters alike? Different?  Discuss the poem to the movie, The 13th Warrior.  The 13th Warrior IMDb Database     Fact Behind Fiction - Eaters of the Dead by Michael Crichton