<P> Doctor Foster is a BBC One drama television series that was first broadcast on 9 September 2015 . The five - part series, written by Mike Bartlett, is about Dr. Gemma Foster, who suspects that her husband is having an affair . After she follows several lines of enquiry, far more in her life unravels, including a streak of violence below the surface . The storyline was inspired by the ancient myth of Medea, a wronged wife who poisons her husband's new bride and kills their children . The second series started on 5 September 2017 and concluded on 3 October 2017 . </P> <Ul> <Li> Suranne Jones as Gemma Foster, a 37 - year - old GP in the town of Parminster, who begins to suspect her husband, Simon, is having an affair . </Li> <Li> Bertie Carvel as Simon Foster, a 40 - year - old property developer and Gemma's husband . </Li> <Li> Clare - Hope Ashitey as Carly Williams, a patient of Gemma's, who helps support Gemma, due to her suspicions of Simon . </Li> <Li> Cheryl Campbell as Helen Foster (episodes 1 - 3) </Li> <Li> Jodie Comer as Kate Parks, a 23 - year - old University Graduate who has been secretly having a two - year affair with Simon Foster . </Li> <Li> Navin Chowdhry as Anwar (episodes 2 - 3, 5) </Li> <Li> Victoria Hamilton as Anna Baker (episodes 1 - 3, 5) </Li> <Li> Tom Taylor as Tom Foster, Gemma and Simon's 11 - year - old son . </Li> <Li> Martha Howe - Douglas as Becky Hughes </Li> <Li> Adam James as Neil Baker (episodes 1 - 3, 5) </Li> <Li> Thusitha Jayasundera as Ros Mahendra . </Li> <Li> Sara Stewart as Susie Parks (episodes 1 - 2, 4 - 5) </Li> <Li> Neil Stuke as Chris Parks (episodes 1 - 2, 4 - 5) </Li> <Li> Robert Pugh as Jack Reynolds (episodes 1 - 2, 4) </Li> <Li> Ricky Nixon as Daniel Spencer (episodes 1, 4) </Li> <Li> Daniel Cerqueira as Gordon Ward, a Hypochondriac who regularly visits Gemma at the medical practice . </Li> <Li> Megan Roberts as Isobel, a friend of Tom's </Li> </Ul> <Li> Suranne Jones as Gemma Foster, a 37 - year - old GP in the town of Parminster, who begins to suspect her husband, Simon, is having an affair . </Li> <Li> Bertie Carvel as Simon Foster, a 40 - year - old property developer and Gemma's husband . </Li>

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