From the Radio Times:
Voyage of the Damned is packed with heart thumping "survivors in peril" moments as The Doctor (David Tennant) leads a motley gang, including plucky waitress Astrid (Kylie Minogue) through the wrecked Titanic after the TARDIS crash lands on the doomed vessel. But their flight is thwarted by a phalanx of homicidal angels. It's Christmas, but they're not remotely interested in peace on Earth. As you'd expect from such a master storyteller, every neccesary element is present- tension, heart-warming moments, cheeky bits, in-jokes and fun. This really is the most special christmas special!