Josette Simon, Blake's 7, TV, 1978-1981. Seen for Dayna Mellanby in what Terry Nation (also the creator of Doctor Who’s Daleks) pitched as The Dirty Dozen In Space… Kirstie’s rivals included Debbie Blythe, Lindsay Duncan, Caroline Langrishe - and Marina Sirtis, who won greater glory as Deanna Troi in 176 episodes of Star Trek: The Next Generation, 1987-1994.