Amy Pond and Rory Williams are trapped on a crashing space liner, and the only way the Eleventh Doctor can rescue them is to save the soul of a lonely old miser. But is Kazran Sardick, the richest man in Sardicktown, beyond redemption? And what is lurking in the fogs of Christmas Eve?

• BBC Cymru Wales
• Matt Smith
• Karen Gillan
• Arthur Darvill
• Michael Gambon
• Katherine Jenkins
• Laurence Belcher
• Danny Horn
• Leo Bill