Turn Left is almost upon us, and with it the much anticipated proper return of Billie Piper as Rose Tyler.
There are shocks in store, as Donna and the Doctor both encounter shocking changes in circumstances, leaving only Rose Tyler – previously stranded in a parallel universe – to sort things out.
With the simple threat of "What if…?", Turn Left looks set to be one of the most memorable episodes of Doctor Who yet. What if Donna had never met the Doctor on her wedding day? Donna, it is revealed, finds help from a mysterious blonde woman – a traveller from a parallel universe. But, as Donna and Rose Tyler combine forces, are they too late to save the whole of creation from the approaching darkness?
Turn Left sees recent history rewritten – and alternate history has become a sci fi staple over the years, so it will be interesting to see what writer Russell T Davies does with it. The episode airs at 6.40pm.