Skins star O’Connell will play Paddy Mayne, while Game Of Thrones actor Allen will appear as Jock Lewes.
The Wire star Dominic West will play Lieutenant Colonel Wrangel Clarke.
Dominic West (Matt Crossick/PA)
The series, set in Cairo in 1941, will also star Kingsman actress Sofia Boutella, Industry’s Amir El Masry and Carnival Row actor Theo Barklem-Biggs.
The show meets Stirling while he is in hospital after a training exercise went wrong.
Convinced that traditional commando units do not work, he creates a radical plan that flies in the face of all accepted rules of modern warfare and fights for permission to recruit the toughest, boldest and brightest soldiers for a small undercover unit that will create mayhem behind enemy lines.
BBC One SAS drama films in UK and Morocco
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BBC One SAS drama films in the UK and Morocco
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SAS: Rogue Heroes - Cast Announced - Press Release
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