Bronagh, leader of the Celts on the island of Eire, told Hercules he was their ""Chosen One"" -- chosen to lead the Celts to freedom. But the gods of Eire didn't like the Celts worshipping Druids, so they sent Morrigan, a demigod assasin, to destroy the Druids. However, when she killed the Druid guardian of justice, she unwittingly took his place. Hercules, who finally stopped blaming himself for Iolaus' death, defeated Morrigan in battle, but the Druids explained that if she died, the spirit of justice would die with her. They disappeared, leaving Hercules to care for Morrigan.

On the island of Eire, Hercules organized the feuding Celtic tribes to fight Caesar's approaching army. He also helped the half-god/half-human Morrigan find the good within herself. She was the former servant of the cruel Celtic god Kernunnos, and she couldn't break away from him easily because he held their daughter, Brigid, hostage. Hercules agreed to help Morrigan get her child back, and together they defeated Kernunnos in battle. When Morrigan stopped Hercules from killing Kernnunos in cold blood, she realized she had finally embraced her new role as the Druid guardian of justice.

Hercules wanted to save the Norse god Balder, but Balder explained that his death was foretold in the Book of Fates and could not be changed. Sure enough, Hercules was tricked by Loki, the god of mischief, into accidently killing Balder. An enraged Thor tried to kill Hercules with his huge stone hammer, but Hercules beat Thor and took him to Valhalla. There, Odin -- the king of the Norse gods -- explained that two parts of an ancient prophesy had been fulfilled. If the third part took place, the final nightfall and end of all things would occur.

Hercules and Morrigan were enjoying life on the island of Eire until they found the Druids slaughtered. Recognizing the work of the demon Dahak, Hercules and Morrigan returned to Sumeria. There, they found Nebula had been bothered by waking dreams of her dead love, Iolaus. When Hercules visited Iolaus' tomb, he found it empty -- and turned to find Dahak behind him, in the body of Ioalus. As they fought, hercules could not bring himself to slay his friend, even though he knew it was no longer Iolaus. Dahak escaped, with Hercules, Morrigan and Nebula in hot pursuit.

Hercules and his friends followed the demon Dahak to Corinth, where Dahak -- in Iolaus' body -- had set himself up as the people's savior. He wanted to return the world to a time when the Titans ruled. Hercules and Zarathustra, a man who resisted Dahak's teachings, found the Stone of Creation and joined Nebula, Morrigan and Jason at the Dark One's fortress. Hercules used the stone to harness the light of dawn. The light became metallic and bound Dahak to his own altar. Hercules then prepared to perform an exorcism that would allow Iolaus to rest in peace.

Dahak, chained to the altar in the body of Ioalus, hatched a plan to kill Ares, which would give him the power to break his bonds. Meanwhile, the demon showed Hercules how he had seduced Iolaus at the moment of death. Apppearing as Hercules, Dahak promised Iolaus the power to set everything right in the world. With time running out, Hercules was sucked into the spiritual world, where he found the real Iolaus. The two friends fought side-by-side once more, sending Dahak into a fiery chasm. Then they siad good-bye, and Iolaus disappeared into a shaft of light.

Havisha, a former priestess of the oracle of Cyprus, and her boyfriend Drayus were killed by thugs on the night he proposed to her. Havisha rose from the dead on a mission of vengeance. After killing the men who murdered her, she attacked the Oracle. Hercules arrived just in time convince Havisha to stop the killing. She departed with Drayus' spirit. The Oracle, meanwhile, gave up her job because in saving her, Hercules had defied the fate she foresaw. Morrigan, who had accompanied Hercules, departed for her own people, but the couple knew they would always have Cyprus.

Merlin hurled the vicious warlord Arthur of Camelot and his sorceress advisor Mab a thousand years back in time to Hercules' world. But Mab helped Arthur conquer Britannia. Later she wanted to go back to her own time, and to do that she needed to kill young Merlin with the sword of Excaliber. Hercules and Morrigan captured Arthur and the sword, but mab took Merlin hostage. A fierce battle ensued, during which Hercules dispatched a giant knight and a reformed Arthur displayed newfound heroism. Merlin smote Mab, and Arthur returned to his own time as a proponent of peace.