Hunting for a deer to serve as a wedding present for his brother, Conor, a young Celtic prince, stumbles upon a young woman
being chased in the woods. He stands up to her pursuers as she flees, and ends up in a bad situation. He is saved by his
guardian, Fergus, and together they go to his brother Aiden's wedding. Later, after the ceremony, Conor goes to the forest to
meet his love, Claire. While he is away, Claire's father, unbeknownst to the both of them, is attacking Conor's village. He
returns to find his home in ruin, and his family dead. From the ashes, Fergus, the champion of Conor's tribe, emerges from the
fort cellar . . . he had been drunk during the attack. Conor sets off to avenge his people, but finds that plan has a few flaws. He
is halted along his way by Galen, an old druid, who leads him to a place called Sanctuary: a hidden cave where former slaves
and others dispossessed by the Roman invasion have found safety. From that safe haven, Conor consults with the best military
strategist on the island (Fergus) and hatches a plan. Sneaking into Gar's fort disguised as his own guards bringing in prisoners,
they attack boldly and defeat the opposition, gaining a number of new recruits in the process. In a final confrontation with Gar,
the man who killed his family and his love, Conor beats the man and leaves him alive. But someone else has other plans . . .
Diana takes Conor's sword and approaches, but finally kills not Conor, but Gar, as he rises up with an ax. Meanwhile, Galen
confronts Longinus, being injured by the Roman's claws before he uses his magic to force him out and away. As the victorious
party celebrates below, Galen vanishes like smoke from the window.
While Conor attempts to gain another village for the alliance, a merchant suddenly appears with what he calls "Atmos": the fire
of the gods, something akin to gunpowder. Having only three barrels of the stuff, he offers to sell it to the highest bidder. The
other tribal leader (a woman named Vorgeen, with whom Conor has just had a bit of a fight) tries to outbid Conor and gain the
Atmos to use against the Romans. Conor finally wins, though, offering his father's torc for the three barrels, which he intends
not to use against the Romans, but to destroy. As the merchant, Quadras, retrieves his barrels by night, however, Longinus
springs on him from the woods and steals the Atmos. Quadras helps the Celts to create more of the Atmos, which they use to
create small bombs hooked to a length of chain for throwing. With this new weapon, they attack Diana's stronghold . . . only to
retreat when they see that the Atmos is killing their own people. As they retreat, the Romans bring forth their new application
of Atmos: the Projector, much like a mortar. Quadras is killed, and the secret of how to make the Atmos dies with him. Tully
and Fergus create a projector of their own, which Conor smashes when he finds out. They orchestrate a raid on Diana's fort to
steal the Atmos and destroy it, but when they get there, the Atmos is gone . . . and they are caught as they attempt to walk out
the gate. Putting the last of her Atmos to good use, Diana has Catlin tied to a pillar, and the projector is brought out. Tully
creates a distraction by throwing a small bag of the Celt's only remaining Atmos into the fire, and the islanders escape. They
return to find a burning village, at the center of which is Longinus . . . sitting on the three missing barrels of Atmos. Conor
escapes just in time, as Longinus sets fire to the barrels in a desperate gamble to end his life. Later, in the wreckage, a scream
is heard as the immortal regains consciousness . . .
The Druids select a young boy named Glas, taking him from his home, believing that the spirit of their previous leader, called
The Father, resides inside the boy. This belief seems to be reaffirmed as the boy lays his hands upon an old Druids head . . .
and the great bonfire behind him suddenly winks itself out. Later, in the woods, Catlin discovers a dead Druid, then another, in
the bushes, where two assassins have killed them with crossbows. They head toward a cave where a light is glinting, and
discover the third Druid signalling with a mirror. He tells the small band to take the Father to his final destination of Cathbad,
and the boy is found further back in the cave, unharmed. Doing as they were asked and escorting the boy on his journey,
though he repeatedly tells them that he would rather go home, they are attacked by a group of men from the boy's village, who
want the Father to stay in their village, where he will benefit their people. Then into the thick of it all comes Queen Diana, who
lets the villages go and takes the boy, keeping Conor's band as prisoners. As Diana attempts to ingratiate herself with the
Father, Longinus emerges from the woods and tells Diana to ask the boy where the spear is. Glas does not answer, but instead
asks Longinus to show him his pain . . . he seems to know that Longinus is not all he appears to be, and comments that he saw
his grandfather die . . . but the Roman is much older than his grandfather. After Longinus suddenly departs, Conor takes the
boy to teach him to hunt. Later that night, they dig a hole to hide in, cover it with a blanket, and when the Romans discover
them gone and begin searching the woods, the Celts sneak out of the now-deserted camp and into the safety of the woods.
The Romans soon catch up with them, however, and Conor is forced to desert his friends and plunge over the cliff with the
Father, leaving Tully, Fergus, and Catlin to fight off a much larger Roman force. Within view of Cathbad, Conor and Glas are
ambushed by the assassins who were sent to kill the boy, and are saved by Fergus, Tully, and Catlin emerging from the
woods; one assassin is killed, the other flees into the woods. The boy arrives safely to the waiting Druids, where he is to be
crowned . . . but the Druid high council, and leader of the High Council, Furbaide, are the ones who contracted for his
assassination. Sneaking back in in Druid's robes, Conor and company watch the proceedings and keep alert for dangers.
Diana, also disguised and watching the ceremony, sees the remaining assassin raise his crossbow to kill the Father, and rushes
up the stairs to stop him. Instead, his bolt lands in her forearm, and her enraged screams alert Conor to the danger. He hands
Glas off to Catlin, just as the assassin charges. They grapple, and Conor saves the boy from the assassin, then Glas saves him,
stabbing the man through the back with a long staff. Glas sees his destiny, and is crowned as the new Druid leader.
As Conor finalizes an alliance with the Culann tribe, the sound of a screaming woman is heard in the night. The local villagers
believe the voice to be that of a banshee, and one villager in particular, a young man named Morvern, whose father died on a
night the banshee was heard to scream, decides to set off and hunt it. Conor has just agreed to help this tribe fight all of its
enemies, so he goes along, reluctantly. The villagers find what they're looking for, and it turns out to be a young woman.
Thinking that the banshee can take any form, they attempt to kill her, but Conor intervenes. He offers to take the "banshee"
with him, so that if she is the legendary creature, the curse will be on Conor and not the Culann. They reluctantly allow him to
take the banshee and go. The young woman does not seem to want to speak, but on the way back to the Sanctuary, Conor's
group is attacked, and a shot fired by Morvern and meant for the woman hits Conor high in the shoulder: a poisoned crossbow
bolt. As the others scramble for cover, the woman removes the bolt from his shoulder and rolls with his unconscious form
down a hill. While she industriously uses her mouth to suck the poison from his wound, Tully, Catlin and Fergus fight off the
attacking villagers. The last of their number, a man who has only been wounded, tries to kill the woman as she kneels over
Conor, but is taken down at the last moment by Catlin. Conor recovers, and they continue on to the Sanctuary, where a child
is born . . . but the young woman, who has since begun talking and revealed her name to be Shannon, screams, much like a
banshee, as the baby is born. The father emerges from the midwife's room, announcing that his child has been born dead. He
blames Shannon for this, and the people of the Sanctuary pressure Conor to have her killed or make her leave. He agrees: she
will go, and he will go with her. Shannon, Tully, Conor, Catlin and Fergus leave the Sanctuary and head toward Shannon's
village to the north, on Mount Cassair. Along the way they are plagued by Morvern, who wants to kill Shannon, thinking her
responsible for his father's death. Shannon, it is revealed, has a gift: she sees things that other people can't, and the people of
her village have the same gift. They also have rules governing its use. Shannon had seen a vision of Conor's death, and had
saved him from that fate, which is expressly forbidden by her people. When they arrive at her village, she is not allowed inside,
but her mother comes out to meet her. She is told that if she goes to a River Tannas and drinks the water, she will forget
everything . . . and never have another vision. Being turned away from her village, the group heads toward the river, where
Shannon says her goodbyes before she forgets everything. She and Conor wade into the water, and she drinks. They emerge
on the bank, and he drapes around her his cloak . . . along with the same clasp which she saw pierced by an arrow in her
vision. Morvern suddenly appears in the water, shooting a bolt that enters Shannon's heart and kills her, but not before she
realizes that it was her own death she saw, and not Conor's. Her mother sent her to this river knowing that she would die, but
also knowing that it would put things to order again. With nature in balance once more, the Celts hear a sound that has not
greeted Conor's ears since his time of the clifftop with Galen: the balance is restored, and again they can hear the ROAR.
Pilot
The Projector
The Chosen
The Banshee
