 Lucas North is a main character in the seventh, eighth, and ninth series; the ninth series reveals that Lucas "isn 't who you think he is." Following the creation of the character by the show's writers, Armitage was chosen early in the casting process, since the producers believed he could carry the mystery of the character. A tentative viewer of Spooks, he was approached for the role following the completion of the second series of Robin Hood, in which he portrayed series regular Sir Guy of Gisbourne. After agreeing to appear in Spooks, Armitage learned how to speak fluent Russian and lost a stone in weight in order to fit the description of his character.
