On the ninth day of Christmas Big Finish offers you: Doctor Who: The Judgement of Isskar - £2.99 - download only for 48 hours.
CLICK HERE to buy The Judgement of Isskar.
If you like this, you can follow the adventures of the Tracer twins to the other Key 2 Time stories, and then into spin-off Graceless.
On a planet where Time stands still, the Doctor meets a woman who is just a few minutes old. She is a Tracer, sent into our Universe by her makers to locate the six segments of the Key to Time. This being without a name wants the Doctor to be her assistant, but she doesn’t tell him the whole truth. Not at first.
Their first port of call is Mars, where a society that one day will become Ice Warriors lives in peace and civility. But the Doctor’s arrival will change all that. The universe is dying, a choice must be made, and the Judgement of Isskar will be declared. The price must be paid - even if it takes centuries…