Life seems easy for picture-perfect couple Ivy and Theo: successful careers, a loving marriage, great kids. But beneath the façade of their supposed ideal life, a storm is brewing – as Theo's career nosedives while Ivy's own ambitions take off, a tinderbox of fierce competition and hidden resentment ignites.
| Actor | Role |
|---|---|
 Olivia ColmanIvy Rose | Ivy Rose |
 Benedict CumberbatchTheo Rose | Theo Rose |
 Andy SambergBarry | Barry |
 Kate McKinnonAmy | Amy |
 Belinda BromilowJanice | Janice |
 Ncuti GatwaJeffrey | Jeffrey |
 Sunita ManiJane | Jane |
 Zoë ChaoSally | Sally |
 Jamie DemetriouRory | Rory |
 Allison JanneyEleanor | Eleanor |
 Delaney QuinnHattie Rose (Younger) | Hattie Rose (Younger) |
 Ollie RobinsonRoy Rose (Younger) | Roy Rose (Younger) |
 Hala FinleyHattie Rose (Older) | Hattie Rose (Older) |
 Wells RappaportRoy Rose (Older) | Roy Rose (Older) |
 Will SmithDerek | Derek |
 Caroline PartridgeSylvia (Food Critic) | Sylvia (Food Critic) |
 Margaret ClunieSophy | Sophy |
| OOllie DabbousHimself | Himself |
 Jude Coward NicollTeenager on Airplane | Teenager on Airplane |
 Akie KotabeAlan | Alan |
 Emily PiggfordLily | Lily |
 Paul PapeCommercial Announcer | Commercial Announcer |
 Ranjani BrowNews Anchor | News Anchor |
 Robin Atkin DownesBoss | Boss |
 Matt CorboyHAL (voice) | HAL (voice) |