Guest Stars Lachlan Murdoch as Constable Henry Higgins Shanice Banton as Violet Hart Samantha Walkes as Cassiopeia 'Cassie' Bright Mark Taylor as Isaiah Buchanan Jonathan Goad as Colonel Michaels Niamh Carolan as Maggie Drew Mike Shara as Dr. Grainger Robert Ifedi as Recruit Hannah Galway as Ellen Kirby James Hicks as Robert Walsh Nik Salt as John Walsh Roland Piers as David Symington