Doctor Who: The Death Collectors (109)

The Death Collectors (a 3-part story)
A virulent disease that killed millions. A missing scientist. An ancient race of salvagers who collect and preserve the dead. The quarantined planet Antikon connects them all. When the Doctor arrives on a sky station above Antikon, a single accident has already set in motion a chain of events that will mean the death of every living thing. And the only way he can stop it is to die. Again.

Spider's Shadow (a 1-part story)
It is the eve of battle and the Martial Princesses Louise and Alison are hosting a royal ball. But there are unwelcome visitors in the garden and a sequence of events spiralling out of control. And what's more, the Doctor doesn't even remember arriving.