There have been lots of parallel worlds and alternate realities in the last few seasons; are we about to meet – or have we already met – The Doctor from a parallel universe?

Consider – the world on which Rose was stranded had a Torchwood, and we all know that our Torchwood was originally created against The Doctor and the threat of Alien invasion by Queen Victoria after her encounter with the werewolf in “Tooth And Claw”‘, so it is perfectly logical to assume that the parallel Torchwood was born out of of a similar event that occurred on that Earth too?

Remember that The Doctors hand in a jar is a “Timelord Detector”? It bubbled and reacted when the TARDIS dragged Martha, Donna and The Doctor to Jennys birth in “The Doctors Daughter” and when it told Captain Jack that The Doctor was close at the end of Series One of Torchwood and during the journey through the vortex towards Professor Yana/The Master at the beginning of “Utopia” – so why was it bubbling ominously when Donna and The Doctor entered the TARDIS just before their encounter with Rose in “The Stolen Earth”?

What did Dalek Caan mean when he called The Doctor the “threefold man”?

On the actor front; David Tennant has already finished filming this years Christmas Special and has confirmed he’ll be in next years specials too… Unless we’ve all been hoodwinked yet again!

So – will Rose and River each end up with our Doctor or his alternate reality counterpart?

Or will Rose or one of our other beloved “Children Of Time” simply just end? (As per Dalek Caans ominous prophecy?)

All of this is – of course – purely conjecture on my part and, though I don’t want the series to end, I can’t wait to find out!

Saturday nights will not be the same again until Series 5 in 2010!