Following GP Tom Kirkman (Dominic Cooper) and working mum Beth Brookes (Romola Garai), the series charts the budding relationship of these two married strangers whose affair detonates across both their families.
But who's who in the new six-parter? Here's a guide to the actors and characters appearing in Adultery.
Romola Garai as Beth BrookesDominic Cooper as Tom KirkmanShelley Conn as Hannah KirkmanMatthew McNulty as Neil BrookesLeila Khan as Jess KirkmanJohnny Sanpher as Ollie BrookesJames Murray as Paul KirkmanCharley Webb as Leah KirkmanAndrew Knott as DaveRomola Garai as Beth Brookes
Where you've seen Romola Garai before: Garai recently starred in ITV's Betrayal but has played Briony Tallis in Atonement, Bel Rowley in the BBC's The Hour and Alice Haughton in Suffragette, with earlier roles in Emma, I Capture the Castle, Vanity Fair and The Crimson Petal and the White. In 2025, she won the Olivier Award for Best Actress in a Supporting Role for The Years.
Dominic Cooper as Tom Kirkman
Where you've seen Dominic Cooper before: Cooper broke through as Dakin in Alan Bennett's The History Boys on stage and screen, then played Sky in Mamma Mia! and its sequel. He starred as Jesse Custer in Preacher and Howard Stark in Marvel's Agent Carter, having introduced the character in Captain America: The First Avenger. You may also recognise him from TV roles in The Last Frontier, The Gold, Suspect and My Lady Jane.
Shelley Conn as Hannah Kirkman
Where you've seen Shelley Conn before: Conn played Lady Mary Sharma in the second season of Bridgerton, DI Vanessa Harmon in Liar and Dean Indira Shetty in Gen V, having most recently starred in Paramount+ psychological thriller Little Disasters. Earlier roles include Ashika Chandiramani in Party Animals, plus Mistresses, Terra Nova and Strike Back.
Matthew McNulty as Neil Brookes
Where you've seen Matthew McNulty before: McNulty played Seth in Misfits, Lieutenant Edward Little in The Terror and Dave in Cleaning Up. His other credits include See No Evil: The Moors Murders, The Paradise, The Mill, Domina and The Rising. He was most recently seen in After the Flood and The Jetty.
Leila Khan as Jess Kirkman
Where you've seen Leila Khan before: Khan made her professional debut as Sahar Zahid in Netflix's Heartstopper, winning the part through an open casting call. She has also appeared in a Death in Paradise Christmas special, Crookhaven and returned to Heartstopper for its third season and concluding film.
Johnny Sanpher as Ollie Brookes
Where you've seen Johnny Sanpher before: Adultery is Sanpher's first television role.
James Murray as Paul Kirkman
Where you've seen James Murray before: Murray is a familiar face on British television, with credits including Cucumber, Suspects, Primeval, The Crown and Masters of the Air.
Charley Webb as Leah Kirkman
Where you've seen Charley Webb before: Webb is best known for playing Debbie Dingle in Emmerdale, a role she held across almost two decades on the long-running ITV soap. She has since featured in Better, The Long Shadow, McDonald & Dodds and Ellis.
Andrew Knott as Dave
Where you've seen Andrew Knott before: Knott began acting as a child, with early roles in The Secret Garden and Black Beauty, and later appeared in Alan Bennett's The History Boys. He is perhaps best known for his role as Dickie in Gavin & Stacey, but has had roles in Casualty, Time, Ackley Bridge, The Walk-In and Protection.
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