Gavin and Stacey's return is overshadowed by Nessa's big news.

Smithy disappears after being told he is to become a father; Stacey must adapt to life in her new home.

Stacey, Gavin, and Smithy head to Barry for Ness' scan.

Mick becomes a minor celebrity for the night, Stacey and Gavin start house-hunting, and Nessa visits Stacey and shows the others a thing or two at the bowling alley

It's Gwen's birthday and Bryn has arranged a special treat, but things take a surprising turn when an uninvited guest turns up, and Stacey tells Gavin of her big decision

Gavin is in Essex without his wife and Stacey is in Barry without her husband, so while Smithy plans a boys' night out, Stacey goes to the bingo, but has living separate lives finally taken its toll on love's young dream?

As Stacey doubts if her love for Gavin is real, Nessa goes into labor and Smithy is nowhere to be found.

The Barry folk come to Billericay for the holiday. Gavin surprises his mum and Smithy with news of his promotion in the company's new operation, located in Cardiff.