The eight-part series, from the makers of Spooks, Hustle and Life On Mars, is written and created by Ben Richards (Spooks, The Fixer) and tells of the dilemmas, loves and lives of the surviving population from Earth as they set up a new world.

Unpredictable and fiercely loyal to President Richard Tate, find out more about PAS Officer Cass Cromwell in this character profile clip…