<span>Grendel is evil, and Beowulf is good so he slays him to eradicate evil and claim a reward.</span>
This is basic, but drama is live, while film is recorded. There can be connections with the audience in dramas. There's usually more (or better) intimacy in dramas. In films, intimacy is usually from a close-up view.
If I had time, I would go shopping with you.