Christmas can mean anything...
 
For Missy, it's solving murders in 1909.
 
For a little girl in Dublin, it's Plasmavores knocking at the door.
 
For Davros, it's a summons from the Doctor who needs the mad inventor's help.
 
The perfect collection for the bleakest - and sometimes brightest - time of the year, these are the tales for when you're halfway out of the dark...