The main antagonists are:
* Fernand Mondego (later known as Count de Morcerf): A childhood friend of Edmond Dantès who betrays him out of jealousy and ambition. He becomes a successful soldier and marries Mercedes, the woman Edmond loved.
* Villefort: A powerful prosecutor who fears Edmond's rise in society and his potential involvement with the Bonapartists. He orchestrates Edmond's arrest and imprisonment.
* Danglars: A jealous businessman who fears Edmond's potential to surpass him in wealth and social standing. He uses his influence to ensure Edmond's downfall.
* Caderousse: A shady acquaintance of Edmond who turns against him for personal gain.
* The Abbé Faria: Though technically not an antagonist, he is initially an obstacle to Edmond's escape from prison. However, he later becomes Edmond's mentor and teaches him the skills he needs to exact his revenge.
It's important to note that the story is more about a struggle against injustice and the consequences of revenge than a clear-cut battle between good and evil. While the antagonists act in a malicious and destructive way, their motivations are complex and often driven by personal fears and insecurities.