Time and the Rani: Part One

The Rani, needing the Doctor's expertise, shoots down his TARDIS, crash-landing it on planet Lykertya where the Doctor dies and subsequently regenerates. She biochemically induces selective amnesia before disguising herself as Mel in order to angle him deceptively into repairing one of her broken machines. The real Mel? Left behind in the TARDIS, alive but unconscious...