Based on the Edith Wharton classic of the same name, Undine Spragg, a fiercely ambitious woman from the Midwest, strives for the social heights of turn of the century New York. Armed with beauty, daring/hustle and sheer force of will/unwavering ambition, Undine battles an entrenched elite, fearlessly courting controversy, until love and fortune align.
| Actor | Role |
|---|---|
 Sydney SweeneyUndine Spragg | Undine Spragg |
 Leo WoodallNot listed | Not listed |
 Josh FinanNot listed | Not listed |
 Louis GarrelNot listed | Not listed |
 Matthew GoodeNot listed | Not listed |
 Rose LeslieNot listed | Not listed |
 Martha PlimptonNot listed | Not listed |
 Irène JacobNot listed | Not listed |
 Hugh DancyNot listed | Not listed |
 Ian HartNot listed | Not listed |
 James McArdleNot listed | Not listed |
 Rosie SheehyNot listed | Not listed |
 Louisa HarlandNot listed | Not listed |
| RRonkẹ Adékọluẹ́jọ́Not listed | Not listed |
 Dominic WestNot listed | Not listed |
 Miranda RichardsonNot listed | Not listed |
 Sofia St. JamesUndine's Double | Undine's Double |