Cathal O'HallinPhotoCathal O'HallinPhotoCathal O'HallinGalleryCathal O'Hallin is known for his work on Vikings (2013), The Hole in the Ground (2019) and Desmond (2016).Known for8.1Vikings2013Desmond2016ActorDesmond2016Vikings201313 episodesVikingsSeason 2S2E10The Lord's PrayerS2E2InvasionS2E3TreacheryS2E4Eye for an EyeS2E5Answers in BloodS2E6UnforgivenS2E8BonelessS2E9The ChoiceSeason 3S3E1MercenaryS3E2The WandererS3E3Warrior's FateS3E4ScarredS3E6Born Again
