Guest Stars Caoilfhionn Dunne as Brearn Caolan Byrne as Arin Anthony Barclay as The Traveller Billy Jenkins voices Young Veran Gary Sharkey as Druid Elder Harry McEntire voices Young Harka Pauline Turner as Stumpy Celt Flora Easton as Young Hunter Lucy Ellinson as Blue Queen Sean Baker as Celt Informer Jake Mann as Roman Soldier 2 Omar Austin as Praying Soldier Lynsey Beauchamp as Druid Elyot Burnett as Roman Soldier 1