Guest Stars John Kavanagh as The Seer Nathan O'Toole as Bjorn Lothbrok Co Starring Maude Hirst as Helga Jefferson Hall as Torstein Tadhg Murphy as Arne Ruby O'Leary as Gyda Lothbrok Diarmaid Murtagh as Leif Elinor Crawley as Thyri Haraldson Niall Ó Sioradáin as Priest Uppsala Damien Devaney as Priest 1 Paul Ward as Priest 2 Rudi Kennedy as Young Man Steve Wilson as Horik's Companion