The Eight Doctors

'Trust the TARDIS...'
Recuperating after the trauma of his recent regeneration, the Doctor falls foul of a final booby-trap set by his arch-enemy, the Master.
When he recovers, the disorientated Doctor looks in a mirror and sees the face of a stranger. He knows only that he is called "the Doctor" — nothing more. But something deep inside tells him to trust the TARDIS, and his hands move over the controls of their own accord.
The TARDIS takes him to a strangely familiar junkyard in late-nineties London, where he is flung into a confrontation between local drug-dealers and Samantha Jones, a rebellious teenager from Coal Hill School.
But the Doctor soon finds the TARDIS transporting him to various other places in order in order to recover all his memories — and that involves seeing seven strangely-familiar faces...
This novel is the first in a new series of adventures featuring the Eighth Doctor.