Gavin begins his new job in Wales and his parents and Smithy travel to Wales for Neil's christening. In the next episode Gavin and Stacey, and Nessa and her child Neil, spend the weekend at Pam and Mick's, and after a drunken night, it is believed that Nessa and Smithy may have once again had sex after waking up in bed together the next morning. Gavin and Stacey begin trying for a baby and Stacey is upset and disappointed when she learns that they may not be able to have children. Gavin becomes depressed and preoccupied with this issue, and in an attempt to cheer him up, Pam, Mick and Smithy arrange a surprise trip to Barry beach on a sunny bank holiday. Nessa and Dave also run into trouble after Dave learns about her alleged sexual intercourse with Smithy, but the two decide to go ahead with the wedding. In the final episode, Stacey discovers she is pregnant after all, and the couple are overjoyed and excited. Smithy shows up at Nessa and Dave's wedding ceremony with Neil, pleading for her not to marry him, and accusing her of not loving Dave. Dave, much to everyone's surprise, agrees with Smithy that Nessa does not love him, and the ceremony is called off. The series ends showing the four (Gavin, Stacey, Nessa and Smithy) six months later on Barry beachfront, with a visibly pregnant Stacey.
