sˈɛvɹəl ɹᵻkˈɜːɹɪŋ kˈæɹɪktɚz wɜːɹ ˈɔːlsoʊ ˌɪntɹədˈuːst ðɪs sˈiːzən, ɪŋklˈuːdɪŋ wˈɜːnɚ stˈɑːkɚɹ æz ɪmˈɔːɹɾəl mˈʌŋk dˈɛɹɪəs, ɹˈoʊlənd ɡˈɪft æz hˌɛdənˈɪstɪk kˈɪlɚ zˈeɪviɚ sənt. klˈaʊd, ᵻlˈɪzəbəθ ɡɹˈeɪsən æz ˌɪntɚnˈæʃənəl θˈiːf ɐmˈændə, ɹˈɑːdʒɚ dˈæltɹi æz ɪmˈɔːɹɾəl hjˈuː fɪtskˈɛɹn ænd pˈiːɾɚ hˈʌdsən æz dʒˈeɪmz hˈɔːɹtən, ðə lˈiːdɚɹ ʌvðə hˈʌntɚz, ɐ ɡɹˈuːp ʌv mˈɔːɹɾəlz hˌuː bᵻlˈiːv ðæt ɪmˈɔːɹɾəlz mˈʌst biː ᵻlˈɪmᵻnˌeɪɾᵻd.
Several recurring characters were also introduced this season, including Werner Stocker as Immortal monk Darius, Roland Gift as hedonistic killer Xavier St. Cloud, Elizabeth Gracen as international thief Amanda, Roger Daltrey as Immortal Hugh Fitzcairn and Peter Hudson as James Horton, the leader of the Hunters, a group of mortals who believe that Immortals must be eliminated.