Day 5: It's David Tennet

I saw this on facebook yesterday and it made me smile. The only connection to Doctor Who is David Tennet, who is singing the Uncle Scrooge part, was the Tenth Doctor:

The BBC's digital Doctor Who 2016 Adventure Calendar.
Countdown Till Christmas Special Airs: 8 sleeps
Countdown Till This Whovian (probably) sees the Christmas Special: 9 sleeps