It starts in Danes which is ruled by King Hrothgar. The king has become very old and cannot defend his people anymore. They had a big problem with a demon named Grendel who would come everything and attack the Mead-Hall, Heorot killing all sorts of warriors with no problem what so ever and some times he got hungry and would eat the warriors. This is where Beowulf comes in because he is the greatest and a very young warrior who has the ability to kill this demon. Why would someone want to face this demon for no reason and not just avoid it? Well the king tells Beowulf that he owes him a favor for helping his father out in the past and with that being said Beowulf decides that his only option is to fight this demon. The next night he is waiting in the mead-hall for Grendel and just like always Grendel comes running in trying to run the place but Beowulf is standing there waiting. Beowulf grabs Grendel and throws him to the ground and rips of his arm right at the shoulder. Grendel immediately gets terrified and takes off into the woods. Grendel does not make it out of that fight he ends up dying in the forest a little while after.
After all that everyone is happy and they throw a huge party for Beowulf and give him gifts. Everyone is celebrating and having a great time, then they fall asleep. Little does everyone know Grendel's mom is not the best at taking a sons death, she finds out what happens and wants revenge. While everyone is sleeping she goes to the mead-hall and starts attacking it. Warriors start waking up and she got very startled and scared and ran away. A group of men and Beowulf tracked her back to a cave that was only accessible from the bottom of a lake. Beowulf of course the man he is jumps in without any hesitation and finds the cave. The mother then shows herself and Beowulf is ready for battle. As all of this is happening a couple of his men walk off into the distance thinking that Beowulf will not be able to defeat his mother. Beowulf is in a one on one battle with her but find a sword nearby in Grendel's mom's chess in the cave. Beowulf has done it again and slayed Grendel's mom even though the poisonous blood melts the blade he still comes out of that cave with the sword in hand and everyone knows immediately he has done it again with the head of Grendel's mother in his other hand!!
Once again everyone is giving Beowulf gifts and thanking him. All is well and everyone is happy. Finally Beowulf and his men ,also known as the Geats, leave the land of Danes and return to Geatland where he is a lord of King Hygelac. Eventually the Hygelac and his family all die off because of blood feuds and all that fun stuff. Beowulf becomes kind and he was king for 50 years before he decided to give it up. One day he hears of a thief who has awoken a dragon and was destroying the villages of Geatland and Beowulf just wasn't having it. Beowulf takes 11 of his finest men to fight this dragon but all of them run besides 1 man by the name of Wiglaf. With Wiglaf they are able to defeat the dragon but unfortunately Beowulf was severely injured and does not make it out of that battle alive. Although he saved his people and freed them from this dragon there was a big price to pay. I mean he probably was like 70 at the time which is like 40 years over what normal people lived then so he was probably cool with it. His people who not let him die and be forgotten so they had a huge funeral pyre for him and they loaded it with treasures and goodies. They burned the pyre and after they burned it down they went on for 10 days building a huge barrow filled with treasure so everyone in the coming years will know what the noble man Beowulf did to save Geatland and the Danes.