Continued from season 3. The Doctor finds his TARDIS colliding with a spaceship based on the RMS Titanic during a Christmas party. With the help of a waitress named Astrid, the Doctor must take on the race called the Hosts as the lives of the Titanic crew and those on Earth are in danger.

• Kylie Minogue
• Russell Tovey
• George Costigan
• Andrew Havill
• Bruce Lawrence
• Clive Swift
• Jimmy Vee
• Bernard Cribbins
• Doctor Who
• David Tennant
• Geoffrey Palmer
• Paul Kasey