George and Charles embark on a historical trip to Spain. Mary attempts one last throw of the dice to ensure absolute power.
| Name | Type | Role | |
|---|---|---|---|
| D.C. Moore | Writer | ||
| Laura Grace | Writer | ||
| Giulio Mezza | Guest Star | Elias | |
| Robert Lonsdale | Guest Star | Felton | |
| Neil Edmond | Guest Star | Napier | |
| Àlex Brendemühl | Guest Star | Olivares | |
| Isla Ling | Guest Star | Young Mary | |
| Mirren Mack | Guest Star | Katherine Manners | |
| Francesca D’Souza | Guest Star | Alexandra | |
| Aine Mcnamara | Guest Star | Spanish Infanta | |
| Yezuan Calvis | Guest Star | Pedro | |
| Tina Rizzo | Guest Star | Isabella | |
| Alessandro Piavani | Guest Star | Arthur Brett | |
| Jim Sturgeon | Guest Star | Dr Harvey | |
| Florian Cossen | Director |