Gavin & Stacey Christmas SpecialCorden and Jones also wrote the teleplays.

BBC America previously aired the first two seasons.
Here are the network's descriptions of the upcoming programs:
Gavin & Stacey Christmas Special: Last season ended with Gavin and Stacey reuniting after a difficult separation and happily celebrating the birth of Smithy and Nessa's baby. Now it's Christmas Eve and Stacey's family decide to join Gavin's for one of his dad's famous turkey dinners.
Chaos erupts -- obviously. Smithy, excited about his first Christmas with his son, doesn't count on Nessa's boyfriend Dave Coaches (Steffan Rhodri) tagging along and hilarity ensues throughout the day as Smithy's jealousy builds.
The neighbors Pete (Adrian Scarborough) and Dawn (Julia Davies) get embroiled in a family argument and it ends with Pete punching Dave Coaches.
Meanwhile Stacey's older brother, Jason (Robert Wilfort) and Uncle Bryn (Rob Brydon), have a heart-to-heart about "that" mysterious fishing trip from season one while Gavin and Stacey's reveal their plan to move to Barry Island which doesn't quite turn out to be the Christmas present their families were expecting.
Gavin & Stacey Season 3: As Gavin starts his new job, the move to Barry Island means big changes for the whole family. Gavin's parents, Pam and Mick have to adjust to an empty nest while Stacey's mom, Gwen's got a full house again. Stacey's in her element, but will this finally be the solution to the couple's long-distance problem? And how will Gavin take to living in Wales?