From NetFlix:

In an adventure imbrued with blood and tragedy, the legendary Norseman Beowulf (Gerard Butler) must command an army across the seas of ancient Northern Europe to conquer the evil troll Grendel. Anticipating his epic crusade against the wrathful monster, the warrior must arbitrate his emanating notoriety and his relationship with the enchanting Selma amid a time of barbaric turmoil and transformation with the emergence of the Christian faith.

There are at least two movie versions of the story. When the 2007 movie came out I decided to plough thru the actual Anglo-Saxon saga of Beowulf. Seamus Heaney produced a version that had Old English on the left side and his English translation on the right side. Frankly, I was a bit bored by the classic saga. It’s fairly straight-forward: man meets monster, man slays monster, man goes back home. So I can see why the movies spiced it up a bit.

I suppose if you are bound and determined to watch a Beowulf film,
this is the version I will put on the list. This version gives the monster
Grendel a personality and a psychological reason for why he slays
the warriors. In fact, he is portrayed as a victim.

This version is very earthy. Both versions portray the warriors as being
very crude. Their language, the topics of their discussions, and their
personal hygiene leaves a lot to be desired. But it all seemed to make
sense. And why wouldn’t a warrior culture devoted to killing, drinking,
and womanizing be a tad crude ?

But if there is any movie with Gerard Butler (this Beowulf) that I would
recommend, that would be “Dear Frankie” which is slightly different
from Beowulf.