Naomi’s Ark by Alison Winter (three parts) Caught up in a galactic evacuation triggered by a supernova, Naomi is separated from her friends, in the company of some very unusual aliens.

The Doctor and Harry are stranded too - and any attempt to reach Naomi is at the expense of a precious, endangered civilisation - one that rivals the Time Lords for longevity and wisdom...

How far will the Doctor go for his friends?