There are many differences in the movie, Beowulf, and the original poem.
For one, Hrothgar was not the father of Grendel. There is never any mention of either Hrothgar or Beowulf ever being romantically involved or enticed to become the fathers of Grendel or the dragon which appear as the major threats in the poem....
There are many differences between the Beowulf movie and the epic text.
1. The epic text is written from a Christian perspective. The importance of Christianity is seen throughout the text. First, Hrothgar builds Heorot because he wishes to give glory to God:
It came to his mind to order his men to build a hall, a master mead-house far mightier than any seen by the sons of earth, and therein would he bestow to young and old all that the Lord should give him, save people's land and the lives of men.
In the movie, Hrothgar and his Danes are Pagan. When Unferth comes to Hrothgar to see if the Danes should pray to the new Christian Lord Hrothgar says no.
Therefore, the ideology of Pagan and Christian are alternated.
2. In the epic text, Grendel attacks Heorot because he, a descendant of Cain, has been exiled into darkness. He could not wage war upon God himself so he, instead, waged war upon God's followers.
On the kin of Cain did the sovereign God avenge the
slaughter of Abel; Cain gained nothing from this feud and was driven far from the sight of men for that slaughter. From him awoke all those dire breeds: ogres, elves, and phantoms that warred with God a lengthy while.
In the movie, Grendel cannot stand the sound of music and singing which emanates from the walls of Heorot.
3. Beowulf, in the epic text, upholds true heroic values and acts accordingly. He stands by the code held up by the Anglo-Saxon culture. Therefore, all of his behaviors spoke to the fact that he was a true hero.
In the movie, Beowulf does not uphold all of the characteristics of a true hero. Instead, he lies about the fact that he killed Grendel's mother and he has an adulterous relationship with his queen's handmaid.
4. Lastly, the dragon which attacks the Geats and Beowulf is simply a new foe which Beowulf must face in order to fulfill his desire to die being a hero. It is best stated by Beowulf as to why a true hero must die as a result of a hero's battle:
“Do not lament, wise sire! It seems better that each man avenge his friends than to mourn them to no end. Each of us must await the end of his path in this world, and he who can, should achieve renown before death! That is the best memorial when life is past and a warrior's days are recounted.
In the movie, Beowulf dies murdering the dragon. While this is true in the text, the dragon's relationship to him is very different. In the movie, the dragon is Beowulf's son-- born as a result of his affair with Grendel's mother. Given the dragon symbolizes his failure, Beowulf feels that he must end the life of his son, the dragon.
1. Beowulf is not shown in heroic light in the movie. Beowulf lies and takes the "easy" way out in the movie. When speaking to Hrothgar in the movie, Beowulf tells Hrothgar that he killed Grendel's mother. While this is true in the epic, it is not true in the movie. Beowulf does not kill Grendel's mother; instead, he engages in a sexual relationship which results in a child (the dragon Beowulf fights at the end of the movie and the text).
2. Beowulf, in the text, is shown by making references to light. His armor shines with the light of God, as does his weapons. In the movie though, Beowulf is known as the dark wolf. This creates a problem because the text aligns light with God and good and darkness with evil and bad. Beowulf would never have been aligned with darkness given his honor and trust in God. It is his job, in the text, to fight against the foe's of God (Grendel, Grendel's mother, and the dragon).