Now take this with a pinch of salt because it's from The Mirror, which is about as trustworthy as other newspapers in that it's usually full of "insider sources", but if this one is true then we'd be very happy Doctor Who fans.
It seems that in the Christmas Special, set to be Capaldi's last as the Doctor, he will be meeting a familiar face from his past for one final trip. His first face.
With original actor William Hartnell long deceased, the First Doctor would be played by another actor, with The Mirror claiming that he would be replaced by none other than Game of Thrones actor David Bradley, who played both Hartnell and the First Doctor to perfection in the emotional 50th anniversary An Adventure in Space and Time.
Now here is where things get even better. They allege that the plot of the Christmas special will link back to the 50th Anniversary of Doctor Who in ways other than just Bradley's reappearance: the special itself will go back to the moment of Capaldi's unexpected first appearance as the Twelfth Doctor in The Day of the Doctor, and task his final mission as helping to save Gallifrey from destruction in the Time War, alongside his fellow Doctors. Talk about the perfect send off.
Rumours will likely be running wild between now and the end of the tenth series, but this one will take some topping and we can only hope that it is true.