Britannia Main cast, played by Laura Donnelly Episode 1x08: Episode 8 (Jan 18, 2018) Episode 1x09: Episode 9 (Jan 18, 2018) Episode 2x02: Episode 2 (Nov 7, 2019) Episode 2x04: Episode 4 (Nov 7, 2019) Episode 2x07: Episode 7 (Nov 7, 2019) Episode 3x05: Episode 5 (Aug 24, 2021)