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The Imposter: episode guide

Episode 1

UK: Monday, December 15, 2025 (Channel 5, 9:00)
Aus: Sunday, December 21, 2025 (10, 8:00)
Written by Jason Herbison
Directed by Kate Kendall

A sprawling Australian seaside hotel sits at the heart of a dispute between matriarch Helen and her adult children Simon, Kate and Ian. They want to sell, but Helen is against the lucrative deal, despite her ailing health. When a woman turns up out of the blue claiming to be the child she gave up for adoption in the UK, Helen believes it could be the answer to her problems.

Cast: Kym Marsh as Amanda, Jackie Woodburne as Helen, Don Hany as Simon, Jane Harber as Kate, Jackson Gallagher as Ian, Charlie Clausen as Todd, Kabir Singh as Lee, Adeline Williams as Corrine, Chi Nguyen as Courtney, Blake Draper as Ryder, Tane Williams Accra as Officer Glenn, Jing-Xuan Chan as Doctor Lee, Brooke Blurton as Naomi, Tim Clarke as Larry, Brett Popplewell as Reg

Episode 2

UK: Tuesday, December 16, 2025 (9:00)
Aus: Sunday, December 21, 2025 (9:00)
Written by Jason Herbison
Directed by Kate Kendall

While Amanda continues to bond with Helen, Simon convinces Kate, Ian and Todd to draw up a legal agreement, preventing Amanda from making a claim on the hotel. Todd tries to hurry the sale of the hotel along, telling Kate they should build a case to petition the courts for Helen's medical power of attorney. Eden demands that Todd allow her the use of an empty luxury house that's for sale.

Cast: Kym Marsh as Amanda/Claire, Jackie Woodburne as Helen, Don Hany as Simon, Jane Harber as Kate, Jackson Gallagher as Ian, Charlie Clausen as Todd, Kabir Singh as Lee, Adeline Williams as Corrine, Chi Nguyen as Courtney, Olivia Deeble as Eden, Blake Draper as Ryder, Tane Williams Accra as Officer Glenn, Paul Ireland as Brian Deadman, Brett Popplewell as Reg

Episode 3

UK: Wednesday, December 17, 2025 (9:00)
Aus: Sunday, December 28, 2025 (8:30)
Written by Jason Herbison
Directed by Kate Kendall

Amanda reveals to Helen that Todd is plotting to obtain a court order to force her medical power of attorney. Later, Helen challenges Kate about the power of attorney. Todd is on the edge, traumatised by the deaths of Ryder and Eden, and wired from a night of illicit drug taking. After witnessing Amanda being secretive with her passport, Kate convinces Ian to invite her over to dinner and find out if she's hiding something.

Cast: Kym Marsh as Amanda/Claire, Jackie Woodburne as Helen, Don Hany as Simon, Jane Harber as Kate, Jackson Gallagher as Ian, Charlie Clausen as Todd, Dannii Minogue as Amanda Metcalfe, Kabir Singh as Lee, Adeline Williams as Corrine, Chi Nguyen as Courtney, Nicholas Bell as Bill, Harrison Popple as Thomas, Tane Williams Accra as Officer Glenn, Brooke Blurton as Naomi, Gig Clarke as Dr Peters, Stephen Mahy as Evan, Sinead Ashlyn Fernandes as Nurse Phoebe

Episode 4

UK: Thursday, December 18, 2025 (9:00)
Aus: Sunday, December 28, 2025 (9:30)
Written by Jason Herbison
Directed by Kate Kendall

At Ian's wake, Helen blames Lee for Ian's salacious demise, citing Lee's history of drug taking. Todd is curious at the revelation that Ian had GHB in his system and sneaks into Ian's house, finding Amanda there, acting strangely.

Cast: Kym Marsh as Amanda/Claire, Jackie Woodburne as Helen, Don Hany as Simon, Jane Harber as Kate, Jackson Gallagher as Ian, Charlie Clausen as Todd, Dannii Minogue as Amanda Metcalfe, Kabir Singh as Lee, Adeline Williams as Corrine, Chi Nguyen as Courtney, Nicholas Bell as Bill, Harrison Popple as Thomas, Blake Draper as Ryder, Olivia Deeble as Eden, Lawrence Price as Funeral Celebrant, Salme Geransar as Detective Allen, Guy Greenstone as Officer Pataki