A dream causes tension between Cait and Divis. Harka sends Love on a heart-breaking mission and Veran commits the ultimate betrayal.
Arriving at the Devni stronghold of Isca, Amena reunites with her sister, Queen Andra. Amena tries to bring Andra into the fold and ally with Rome. Amena takes her case to an assembly of the Devni, but as she does so, Veran arrives with betrayal in mind.
As part of the Trial of Water, Divis throws Cait over a waterfall. Underwater, Cait finds Love shackled in chains and tries to free him.
- David Morrissey as Aulus Plautius
- Nikolaj Lie Kaas as Divis
- Mackenzie Crook as Veran/Harka
- Eleanor Worthington-Cox as Cait
- Annabel Scholey as Amena
- Liana Cornell as Ania
- David Bradley as Quane
- Paul Chahidi as Domitius
- Marion Bailey as Cara
- Samantha Colley as Andra
- Tom Rhys Harries as Mallin
- Geraldine Chaplin as Queen Mother
- Ania Marson as Elder 1
- David Gant as Elder 2
- Kate Cook as Guard
- Keith Chanter as Eye
- Mabel Watson as Ghost Girl
- Caoilfhionn Dunne as Brearn