Something has happened. Something terrible beyond measure. Matter is breaking down, energy is building up, reality is tearing itself apart at the seams and time is going all pear shaped.

To top it all off, a certain draconequus has appeared on the TARDIS pleading for the help of an "old friend", but the Doctor hasn't quite met him yet...while the Doctor's companions have.

Formally Doctor Whoof: ...Sed quis vos teneo