Archaeologist Fiona travels to Ireland to uncover a long-dead tomb. A threat is released and she will have to fight to keep her teenage daughter from falling under the control of The Morrigan, a vengeful Pagan War Goddess.
| Actor | Role |
|---|---|
 Saffron BurrowsFiona | Fiona |
 James CosmoFrancis Crowley | Francis Crowley |
 Emily FlainLily | Lily |
 Art ParkinsonSean | Sean |
 Jonathan ForbesJonathan Horner | Jonathan Horner |
 Michael SheaConor | Conor |
 Sean KearnsUniversity Dean | University Dean |
 Nigel O'NeillTreasurer | Treasurer |
 Antonia Campbell-HughesAncient Morrigan | Ancient Morrigan |
 Desmond EastwoodRescuer | Rescuer |
 Toby StephensMalachy Crowley | Malachy Crowley |
| CCelina ChienChloe | Chloe |
| SSteven CookeRescue Pilot | Rescue Pilot |