The Cuckoo follows Sian, a woman who inserts herself in the lives of Nick and Jessica as she moves into their home as a lodger.
Sian quickly causes trouble for the married couple and their adopted daughter Alice.The trio have moved to their dream home in the country but due to a financial crisis, they are forced to take in a lodger to help pay for their mortgage.
From becoming close with Nick to forming an inappropriate relationship with Alice, it's not long before Jessica realises Sian is not who she claimed to be.
Can the family overcome the chaos Sian causes? As The Cuckoo airs on Channel 5 this week, OK! looks at the cast. Who is in the cast of The Cuckoo?
Read more on ok.co.uk