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