Monster: The Lizzie Borden Story is led by Ella Beatty as Lizzie Borden. Netflix's official cast guide confirms Vicky Krieps as Bridget “Maggie” Sullivan and Elizabeth Báthory, Charlie Hunnam as Andrew Borden, Rebecca Hall as Abby Borden, Billie Lourd as Emma, Jessica Barden as Nance O'Neil and Sarah Paulson as Aileen Wuornos. Joey Pollari plays John Morse.
Ella Beatty — Lizzie Borden
Beatty plays the season's central character and the first female subject of the Monster anthology.
Vicky Krieps — Bridget Sullivan / Elizabeth Báthory
Krieps has two roles: Bridget “Maggie” Sullivan in the Borden story and Countess Elizabeth Báthory in the fantasy flashbacks.
Charlie Hunnam — Andrew Borden
Hunnam plays Lizzie's father after starring as Ed Gein in the previous season of Monster.
Rebecca Hall — Abby Borden
Hall plays Lizzie's stepmother Abby.
Billie Lourd — Emma Borden
Lourd plays Lizzie's older sister Emma. The show dramatizes their later estrangement.
Jessica Barden — Nance O'Neil
Barden plays the actress Nance O'Neil. The real Lizzie met O'Neil after the trial, while Monster moves her into the trial storyline.
Sarah Paulson — Aileen Wuornos
Paulson plays Wuornos in the season's later storyline. The connection to Lizzie is thematic, not historical.
Joey Pollari — John Morse
Pollari plays Lizzie's uncle John Morse, who becomes a suspect in the series.
Quick Cast Guide
Lizzie: Ella Beatty · Bridget/Báthory: Vicky Krieps · Andrew: Charlie Hunnam · Abby: Rebecca Hall · Emma: Billie Lourd · Nance: Jessica Barden · Aileen: Sarah Paulson · John Morse: Joey Pollari.
Sources
Netflix Tudum cast guide · Netflix Tudum: Everything You Need to Know
Fact-check note
This article distinguishes the Netflix dramatization from documented history. Lizzie Borden was acquitted in 1893; claims about guilt, private relationships, motives and events not established by surviving records are described as fictionalized or disputed rather than settled fact.
Netflix Tudum: The True Story · Netflix Tudum: Ending Explained · PEOPLE: Fact vs Fiction · PEOPLE: Emma/Lizzie Fact Check
Related: Monster: The Lizzie Borden Story Cast Guide — Ella Beatty, Charlie Hunnam and More
Related: Ella Beatty on Monster: How She Prepared to Play Lizzie Borden
