Smith swaps Tardis for the airwaves
Matt Smith and Karen Gillan are to become Radio 1 DJs.
The Doctor Who pair will be showing another dimension to their talents as they step in for a guest-presenting slot next month.
Matt - who plays the Doctor - and Karen - sidekick Amy Pond - will be manning the decks on Christmas Eve.
Radio 1 bosses have also lined up a series of appearances from chart and TV stars over the festive period. Gavin And Stacey star James Corden will be doing an hour-long slot on Christmas Eve, as will Tinie Tempah.
On Boxing Day, the station throws over nine hours of its schedule to its star guests who will include Pixie Lott, Plan B, Nicole Scherzinger and N-Dubz.
For a second year, listeners will have a chance to fill a 15-minute slot on Christmas Day during the "tinsel takeover".
The festive period will also see Fearne Cotton present a show from her home and breakfast show DJ Chris Moyles hosting a karaoke special.
Ben Cooper, Deputy Controller Radio 1 and 1Xtra said: "This Christmas we combine festive specials from the DJs with takeovers from top celebrities and an opportunity for listeners to have their own 15 minutes of fame."
Matt and Karen will also feature in the BBC One Christmas schedule with a festive Doctor Who special, A Christmas Carol.