Original: In the earlier episodes, as mentioned in the show's opening title, Hercules' main nemesis is his evil stepmother Hera, the powerful queen of the gods, who seeks to destroy Hercules using various monsters, because he is a reminder of her husband Zeus' infidelity.
Simplified: In the earlier episodes, as mentioned in the show's opening title, Hercules' main nemesis is his evil stepmother Hera, who seeks to destroy Hercules using various monsters, because he is a reminder of her husband Zeus' infidelity.