The warrior Beowulf must fight and defeat the monster Grendel who is terrorizing towns, and later, Grendel's mother, who begins killing out of revenge.
The R-rated trailer of Beowulf was just released and here it is. Sounds a lot like 300. "I am BEOWULF!"
And yes, the graphics are computer generated. Looks quite realistic though.
[Link: Beowulf at IMDB]