Lennie James (The Walking Dead, Line of Duty) will star as locum trauma consultant Glen Boyle, alongside Catherine Walker (Strike Back) as trauma registrar Fiona Lomas, Claire Skinner (Outnumbered) as trauma consultant Lorraine Rappaport and Kimberley Nixon (Fresh Meat) as junior doctor Dr. “Harry” Bennett-Edwardes.

The 13-part series will tell “one story, in one place, in one hour” and is described by Sky as “a real-time medical and emotional roller-coaster ride in which every second counts during the most life-threatening hour of a patient’s treatment”.

Lennie James commented: “The chance to work with Jed again and to come home to be part of such an exciting and ballsy project was too good an opportunity to turn down.”

Creator Jed Mercurio added: “Sky has given the Critical team a once-in-a-lifetime opportunity to create the most realistic and thrilling medical drama. I’m hugely grateful to be involved in such an exciting project.”

Cameron Roach, Commissioning Editor, Sky Entertainment teased: “There is nothing like it on television and we hope our customers relish the characters, atmosphere and pace of this ground breaking show.”

Critical‘s cast also include Neve McIntosh (Doctor Who), Prasanna Puwanarajah (The Half Light), John MacMillan (Silk), Ellen Thomas (Rev), Mali Harries (The Indian Doctor), Paul Bazely (Casualty), Danny Kirrane (Trollied), Peter Sullivan (The Hour), Emma Fryer (Phone Shop), Orion Lee (Skyfall) and Juliet Oldfield (Top Boy).

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