Christopher Eccleston's Ninth Doctor and David Tennant's Tenth Doctor - Matt Smith's only predecessors since 2005's reboot - have both been tipped to make a fleeting cameo next year.
Smith, the sci-fi drama's current Time Lord, is keen for both of the pair to return, but recently admitted he would prefer to bump into Eccleston's "proper hard" Doctor.
However, a legion of Tennant lovers will have noticed the Scot's teasing that he'll jump back into his pinstripe suit at the word go!
Eccleston, on the other hand, has continually ruled out "bath[ing] in the same river twice" - but should The Moff come up with an appropriate story, could that change?
If you remain undecided, whet your appetites with these clips of the Ninth and Tenth Doctors in action.