The 41-year-old will be seen as an evil psychiatric episode alongside new Doctor Matt Smith when the show returns in the spring.
Wadia told The Sun: "It was brilliant to be let out for a couple of days to do something else and it was great working with Matt Smith. (...) I play a bit of a baddie. And yes, like my EastEnders character Zainab, she's not a very pleasant woman - but at least I'm human and not some kind of strange alien life-form."
Psychiatric? Whatever do they mean? Now I'm curious...