- Dimitri Leonidas - Leonidas
- Riz Ahmed - Tarak
- Paul Freeman - Governor Julius Agricola
- Dave Legeno - Vortix
- Axelle Carolyn - Aeron
- Andreas Wisniewski - Commander Gratus
- Jake Maskall - Roman Officer Argos
- Eoin Macken - Achivir
- Rachael Stirling - Druzilla
- Michael Carter - General Antoninus
- Tom Mannion - General Tesio
- Peter Guinness - General Cassius
- Dylan Brown - Roman Guard
- Dermot Keaney - Pict Hunter
- Dhafer L'Abidine - Arm Wrestling Opponent
- Lee Ross - Septus
- Simon Chadwick - Carlisle Messenger
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Andreas Gruber
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Veit Heiduschka, Andreas Gruber
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