Odysseus was on his way home to Ithaca from a very long journey. He could see his home, getting closer and closer he thought nothing could stop him now.
All of the sudden a strange whirlpool appeared out of nowhere and started to suck in Odysseus. Before he knew it, he was getting sucked into the whirlpool watching his home start to disappear.
After it all happened he realized that he was in the underworld. He didn't know who caused the whirlpool or why it was there to stop him, all he knew was that he was face to face with Cerberus.
Odysseus fought Cerberus, not knowing what other choice he had in that situation. They were both having an epic battle one deadly attack after another.
Then out of nowhere, in the middle of their epic duel. He just appeared back to where he was in some random boat that wasn't even his, but he was thankful to be out of that situation and heading back home.
He finally got to the shores of Ithaca feeling so relieved to be home after 20 long years. But he knew that he had to find his wife and son to make sure they were ok.