<Ul> <Li> Victor Williams as Detective Jeffries </Li> <Li> John Doman as Bruce Butler , Helen 's father </Li> <Li> Kathleen Chalfant as Margaret Butler , Helen 's mother </Li> <Li> Mare Winningham as Cherry Lockhart , Cole 's mother </Li> <Li> Colin Donnell as Scott Lockhart , Cole 's brother </Li> <Li> Danny Fischer as Hal Lockhart , Cole 's brother </Li> <Li> Michael Godere as Caleb Lockhart , Cole 's brother </Li> <Li> Kaija Matiss as Mary - Kate Lockhart , Hal 's wife </Li> <Li> Deirdre O'Connell as Athena Bailey , Alison 's mother </Li> <Li> Nicolette Robinson as Jane , waitress at The Lobster Roll </Li> <Li> Darren Goldstein as Oscar Hodges , owner of The Lobster Roll </Li> <Li> Stephen Kunken as Harry , a publisher </Li> <Li> Lynn Cohen as Joan Bailey , Alison 's grandmother ( season 1 ) </Li> <Li> Jennifer Esposito as Nina Solloway , Noah 's sister ( season 2 -- present ) </Li> <Li> Richard Schiff as Jon Gottlief , Noah 's attorney ( season 2 ) </Li> <Li> Joanna Gleason as Yvonne , a publisher who , along with her husband Robert , owns the guest house in which Alison and Noah stay ( season 2 ) </Li> <Li> Peter Friedman as Robert , Yvonne 's husband ( season 2 ) </Li> <Li> Abigail Dylan Harrison as Stacey Solloway ( season 3 -- present ) </Li> <Li> Brendan Fraser as John Gunther , a prison guard ( season 3 ) </Li> <Li> Reagan and Savannah Grella as Joanie , Alison and Cole 's daughter ( season 3 -- present ) </Li> <Li> Christopher Meyer as Anton Gatewood , an intelligent student at the school where Noah teaches ( season 4 ) </Li> <Li> Emily Browning as Sierra , Helen and Vik 's neighbor ( season 4 ) </Li> <Li> Ramon Rodriguez as Ben Cruz , a Marine veteran and Alison 's love interest ( season 4 ) </Li> <Li> Zenobia Shroff as Priya Ullah , Vik 's mother ( season 4 ) </Li> </Ul>
<Ul> <Li> Victor Williams as Detective Jeffries </Li> <Li> John Doman as Bruce Butler , Helen 's father </Li> <Li> Kathleen Chalfant as Margaret Butler , Helen 's mother </Li> <Li> Mare Winningham as Cherry Lockhart , Cole 's mother </Li> <Li> Colin Donnell as Scott Lockhart , Cole 's brother </Li> <Li> Danny Fischer as Hal Lockhart , Cole 's brother </Li> <Li> Michael Godere as Caleb Lockhart , Cole 's brother </Li> <Li> Kaija Matiss as Mary - Kate Lockhart , Hal 's wife </Li> <Li> Deirdre O'Connell as Athena Bailey , Alison 's mother </Li> <Li> Nicolette Robinson as Jane , waitress at The Lobster Roll </Li> <Li> Darren Goldstein as Oscar Hodges , owner of The Lobster Roll </Li> <Li> Stephen Kunken as Harry , a publisher </Li> <Li> Lynn Cohen as Joan Bailey , Alison 's grandmother ( season 1 ) </Li> <Li> Jennifer Esposito as Nina Solloway , Noah 's sister ( season 2 -- present ) </Li> <Li> Richard Schiff as Jon Gottlief , Noah 's attorney ( season 2 ) </Li> <Li> Joanna Gleason as Yvonne , a publisher who , along with her husband Robert , owns the guest house in which Alison and Noah stay ( season 2 ) </Li> <Li> Peter Friedman as Robert , Yvonne 's husband ( season 2 ) </Li> <Li> Abigail Dylan Harrison as Stacey Solloway ( season 3 -- present ) </Li> <Li> Brendan Fraser as John Gunther , a prison guard ( season 3 ) </Li> <Li> Reagan and Savannah Grella as Joanie , Alison and Cole 's daughter ( season 3 -- present ) </Li> <Li> Christopher Meyer as Anton Gatewood , an intelligent student at the school where Noah teaches ( season 4 ) </Li> <Li> Emily Browning as Sierra , Helen and Vik 's neighbor ( season 4 ) </Li> <Li> Ramon Rodriguez as Ben Cruz , a Marine veteran and Alison 's love interest ( season 4 ) </Li> <Li> Zenobia Shroff as Priya Ullah , Vik 's mother ( season 4 ) </Li> </Ul>
who plays sierra in the affair season 4
who plays sierra in the affair season 4
Emily Browning
Emily Browning