User:SOTO/Forum Archive/The Panopticon/@comment-1293767-20150822045244/@comment-1293767-20150829190003
From Tardis Wiki, the free Doctor Who reference
The Time of the Doctor is included in the Category:Cracks arc, three-and-a-half years after it "concluded" in The Big Bang.
Revolutions of Terror and The Fountains of Forever are also included in the Knock four times arc category.