First broadcast 17th/18th January 2011.<br /><br />At Hillsdon Army base, a training camp for soldiers fighting in Afghanistan, young soldier Mark Blakefield is still recovering from the death in action of his friend Danny Ferris and argues with Lieutenant Lockford, who was having an affair with Danny's girl-friend 'Cats' Felton, a fact which Lockford's wife Claire has also discovered.<br /><br />Tom Ward - Dr. Harry Cunningham<br />William Gaminara - Prof. Leo Dalton<br />Emilia Fox - Dr. Nikki Alexander<br />Kieran Bew - Lt Stephen Lockford<br />Nathanael Baring - Danny Ferris<br />David Ajala - Mark Blakefield<br />Orion Lee - Dr. Oliver Matthews<br />Darren Morfitt - Sgt. Jason McDermott<br />Theo Barklem-Biggs - Joseph Ryland<br />Brendan Mackey - Dennis Croft<br />Abigail Hardingham - Catherine 'Cats' Felton (as Abi Hardingham)<br />Michelle Fairley - DI Suzy Harte<br />Phaldut Sharma - DS James Stern (as Paul Sharma)<br />Arsher Ali - Zak Khan<br />Ralph Laurila - Ryan Axel<br />Steve Nicolson - Major Julian Rutherford<br />Philip Whitchurch - Mr. Ferris<br />Emma Lowndes - Claire Lockford<br />Kirsty Mitchell - Lottie Jenkins<br />Alicya Eyo - Joanne McDermott<br />Sarah Lowe - Nurse<br />Philip Whitchurch - Martin Ferris<br />Josette Simon - Mrs. Ferris<br />Kirsty Mitchell - Charlotte Jenkins
