The full trailer for the highly anticipated Gavin and Stacey Christmas special has been released.
The clip opens with Smithy (James Corden) arriving at the Shipman household to visit Gavin (Matthew Horne), Pam (Alison Steadman) and Mick (Larry Lamb).
The group then break into a rendition of Elton John's 'Step Into Christmas'.
C0-creator Ruth Jones reprises her role as Nessa and delivers her famous catchphrase: "What's occuring?"
We then see Uncle Bryn (Rob Brydon) make a mess of the Christmas dinner.
Gavin and Stacey originally ran for three series on BBC from May 2007 until January 2010.
The one-hour episode will air on Christmas Day on at 8.30pm BBC One.