Grendel is first introduced to the story while saying his sad and depressed. Introducing Grendel, King Hrothgar, the Danes, who live in Herot. In this case, Grendel is the antagonist and is stubborn to happy feelings like his past ancestor Cain.
Grendel attacks Herot and kills many men and villagers. A strong respected hero named Beowulf hears about the battle and decides to help out so he sails to Herot with 30 strong men of his. Grendel and Beowulf fight, Beowulf scratches Grendel without him noticing.
Grendels mother hears about Grendel's death and her motherly defensive side comes out. She fights Beowulf and fortunately, she dies. Later in life, Beowulf dies peacefully and gets remembered as a legend.