- Shelley Conn - Danni Prendiville
- Nicola Stephenson - Diane Porter
- Jimi Mistry - Maj. Jamal Ashkani / Latif
- Amanda Mealing - Col. Eleanor Grant
- Sullivan Stapleton - Sgt. Damien Scott
- Philip Winchester - Sgt. Michael Stonebridge
- Eva Birthistle - Captain Kate Marshall
- Rhashan Stone - Major Oliver Sinclair
- Charles Dance - Conrad Knox
- Rhona Mitra - Maj. Rachel Dalton
- Robson Green - Lt. Col. Philip Locke
- Vincent Regan - Karl Matlock
- Liam Garrigan - Sgt. Liam Baxter
- Michelle Lukes - Sgt. Julia Richmond
- Lyne Renee - Rebecca
- Yasemin Kay Allen - Katrina Zarkova
- Michelle Yeoh - Mei Foster
- Stephanie Vogt - Christy Bryant
- Roxanne McKee - Captain Natalie Reynolds
- Varada Sethu - LCpl. Manisha Chetri / Chetri
- Thulasizwe Kubheka - Guard 1
- Nina Sosanya - Colonel Adeena Donovan
- Attila Árpa - Laszlo
- Alexis Peterman - Natalie
- Cal MacAninch - Major Chris Pemberton
- Eamonn Walker - Walter Lutulu
- Peter O'Meara - Maj. Brian Donoghue
- Vithaya Pansringarm - Chanrok
- Arthur Lee - Lee Dae Ho
- Akira Koieyama - Akiyama
- Annabelle Wallis - Dana Van Rijn
- Catherine Walker - Mairead McKenna
- Brian Milligan - Teague
- Max Beesley - Ray McQueen
- Christian Antidormi - Finn
- Alexander Siddig - Zahir Sharq
- Phil Dunster - LCpl. Will Jensen
- Rhianne Barreto - Maya
- Faizal Hussein - Hassan Ahmed
- Ky Discala - SOPHIA
- Claire Cooper - Amy
- Thira Chutikul - Thai SWAT
- Nina Seničar - Elvanna
- Mark Strepan - Josef Varga
- Maxim Baldry - Loric Demachi
- Marina Fernández - Lawyer
- Pallavi Sharda - Samira Shah
- Florence Bensberg - Riley
- Alyy Khan - Major General Kohli
- Fanny Müller - Woman
- Matthew Leitch - Kennedy
- Tom Nguyen - Squad Captain
- Karen David - Barmaid
- Echo Quah - Ah Loong
- Robert Beg - Lab Manager
- Laura Greenwood - Alexandra "Lexie" Porter
- Iain Glen - Gerald Crawford
Charles Dance interpreta a Conrad Knox en la serie.
Michelle Yeoh hace el papel de Mei Foster.
Alexander Siddig hace el papel de Zahir Sharq.
Warren Brown hace el papel de Sergeant Daniel “Mac” Macallister.
Daniel MacPherson hace el papel de Sergeant Samuel Wyatt.
Alin Sumarwata interpreta a Lance Corporal Gracie Novin en la serie.
Jamie Bamber interpreta a Col. Alexander Coltrane en la serie.
Thulasizwe Kubheka hace el papel de Guard 1.
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