Stirling and Lewes plan to parachute men into the desert to attack behind enemy lines.
While recovering in the hospital, Stirling ruminates on Lewes' idea to attack the enemy from behind and hatches an audacious plan to get approval for their unit from General Auchinleck at GHQ.
The newly recruited members of the SAS embark on a disastrous first mission.
As the SAS reputation spreads among the Axis Italian and German forces, another daring mission results in a shocking and devastating loss to the team.
Stirling leads a raid on Benghazi while Paddy trains the newly arrived Free French soldiers.
A meeting with Winston Churchill sees the SAS embark on their most daring operation to date. While success sees them achieve official status, Stirling receives some terrible news.
Connor Swindells
David Stirling
Jack O'Connell
Paddy Mayne
Alfie Allen
Jock Lewes
Dominic West
Lieutenant Colonel Wrangel Clarke
Sofia Boutella
Eve