Nessa and Dave's wedding day approaches. Gavin hears some life changing news from his wife. Bryn and Jason finally deal with their secret. Smithy wishes Nessa all the best as she prepares to get married.

Stacey and Gavin return from honeymoon to a big welcome from both families. But Smithy seems none too happy with his best mate and Nessa has a confession to make that throws the whole evening into disarray.

The wedding day has finally arrived, but will they go through with it? Will Uncle Bryn finally admit to what happened on the fishing trip and will Nessa do what she knows she must?

Stacey travels to Essex and back into the arms of Gavin. Everything seems perfect until Pam and Mick offer to cover the down payment on a house for Gavin and Stacey.

Those in Essex decide to head for the beach and enjoy their Bank Holiday Monday. Gavin has a heart to heart with his father. Nessa and Smithy are caught by Dave enjoying a good time together.

After his initial angry reaction to Stacey's news, Uncle Bryn agrees to drive them all to Essex to meet the Shipmans. Pam has laid on a cracking spread and the party goes with a bang. But then Gavin and Stacey make an announcement that throws all the bonhomie out the window.

Devastated by the news he's to become a father, Smithy goes AWOL. The boys finally track him down, but can he be persuaded to do the right thing? Stacey is shocked to hear of Gwen's new domestic arrangements as the prospect of living in Essex finally hits her.

Stacey is miserable and homesick because she still hasn't got a job, or her own home. She feels she's getting under everyone's feet, especially when Pam interrupts her during her shower. Gavin tries to console her but she says he just doesn't understand. Pam admits to Dawn that having the newlyweds staying in her house is getting a bit much. (Dawn and Pete are still looking for a threesome.) Gavin and Stacey go to view a potential flat and are shown round a tiny, dirty studio by over-enthusiastic estate agent Duncan.

Stacey and Gavin are still in conflict over where they should live, with Gavin refusing to even consider the idea of living in Barry. Smithy admits to Gavin that he had another fling with Nessa and realises he's going to have to face her again at the surprise party Bryn is throwing for Gwen. Bryn is panicking because he wants to keep the surprise barn-dance themed party a surprise…but he's also having trouble getting enough people to attend.

Stacey makes sure that Gavin stick to the promise he made her as she looks for a new job. When Nessa makes plans to take the baby to see Smithy in Essex, Dave isn't happy.

Pam and Mick talk about their new conservatory. Bryn is looking forward to everyone staying over at his place when a night out in Cardiff is organised for the boys. Smithy is worried about seeing Nessa again after what happened last time. Stacey isn't sure whether she tell Gavin after making a worrying discovery.

After being phone buddies for months, Gavin and Stacey finally arrange a rendezvous in Leicester Square, with Stacey's best friend Nessa and Gav's pal Smithy coming along for support.

The Shipmans drive down to Wales for the wedding fayre. After an eventful trip to church to hear the banns being read, Nessa confides in Stacey her big secret.

Stacey's brother Jason arrives home early, much to Uncle Bryn's horror. Stacey has her hen night and Gavin has two stag nights, the second of which reveals something about Stacey that could jeopardise the whole wedding.

Stacey feels dejected because she cannot get a job and Pam tells her she needs to get out more. Smithy needs Gavin's shoulder to cry on because his girlfriend split with him over Nessa's pregnancy and told him she was seeing a younger man anyway. Gavin, Stacey and Smithy head for Barry so that Smithy can go for the scan with Nessa. Smithy lodges with Bryn, who has turned his spare room into a gym and sets about getting Smithy into shape.

After a huge misunderstanding on the phone, Stacey thinks Gavin has finished with her. He drives to Wales to explain and ends up taking her home with him. Having never been further than Bridgend before, Stacey's trip to Essex is an eye-opening experience that ends with the biggest surprise of all.

Gavin seeks counselling for his marriage troubles from Smithy, but Smithy’s idea of relationship therapy is to organise a surprise lads night out at a nightclub foam party. While the lads are knee deep in foam, Stacey is with her family at a bingo night.

Stacey is happy to be living back in Barry as Gavin starts his new job in Cardiff. Smithy tries to adjust life without Gavin back in Essex. Everyone is reunited when the baby is christened.

Gavin isn't happy with his in laws knowing everything about his and Stacey's sex life. Pete and Dawn get ready to renew their wedding vows in Billercay and everyone heads off to be there.