The Liver Birds and Series 1 starred Pauline Collins as Dawn and Polly James as Beryl Hennessey. In Series 2, Nerys Hughes debuted as Sandra Hutchinson, replacing Dawn for the rest of the programme's run. The Beryl-and-Sandra pairing is generally regarded as the programme's best period. Beryl was the more 'common' one, while Sandra was soft-spoken and more refined, due to the influence of her snobbish, overbearing mother (Mollie Sugden). Carla Lane drew on her own mother for the character – "Mrs Hutchinson, I think she was my mother. I'm sure she was my mother". Beryl's 'common' mother (the Hennesseys live in Bootle,
Polly (Doctor Who) to Professor Brett. Brett develops the artificial intelligence known as WOTAN, and Polly meets the Doctor (William Hartnell) and Dodo (Jackie Lane) when they come to investigate it. Polly befriends Dodo and takes her to a London nightclub called the Inferno, where they meet Ben Jackson (Michael Craze) and try to cheer up the Royal Navy sailor. When Polly is accosted by another patron in the Inferno, Ben comes to her rescue. Eventually, Ben and Polly aid the Doctor in his fight against WOTAN when the computer tries to take over the world. They are the bearers of the news