With Victor Frankenstein being the protagonist, the clear and true antagonist, the one who poses a threat and actively opposes him, is the monster. When Frankenstein learns of his Brother William's death, he sees the monster lurking in the woods near where William was killed. He is immediately and firmly convinced that the monster is the perpetrator. While he knows that the monster is guilty and Justine Moritz is innocent, he can not fully prove it, and Justine is executed. He is put into a world of despair, having lost two loved ones within the same time frame. Later in the novel, the monster vows to be with him on his wedding night. Shortly after, Henry Clerval is murdered, and it is obvious who the culprit is. Victor was arrested for the murder of Henry, and kept in prison where he fell ill. By this point, the monster had already killed a total of 3 people, indirect or otherwise, put Victor in a depressed state twice, and had him thrown in jail once. But the atrocity of the story was still to come. On his wedding night, the monster did in fact visit Frankenstein, just as it said it would. But it wasn't the Doctor's life it wanted. Instead it took the life of his newly wedded and beloved wife. To Victor, Elizabeth was the only thing that kept him sane with the thought that the monster was still out somewhere in the world, and now that she was gone, he had nothing left to lose. He chased the monster through the Arctic Ocean, where he fell through the ice and was rescued by Captain Walton and his crew. After telling his story, he passed away. The monster was responsible for so many deaths, so much hatred, sorrow, and tragedy, and in the end, he was responsible for the death of his creator. These are the qualities of a true antagonist.