[QUOTE=Peter Morris]
A villain/ ess in the Doctor Who story The Hand Of Fear
[/QUOTE]
I knew it was Doctor Who, but couldn’t think of the title. It was the closest I’ve come to an answer. 
I’m sure I won’t get even that far on any other.
[QUOTE=The New and Improved Superman]
Raven Darkholme
[/QUOTE]
Mystique.