- 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 interpreta a Mei Foster en la serie.
Alexander Siddig interpreta a Zahir Sharq en la serie.
Warren Brown interpreta a Sergeant Daniel “Mac” Macallister en la serie.
Daniel MacPherson interpreta a Sergeant Samuel Wyatt en la serie.
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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