Cult
The EastEnders star was given time away from Albert Square to film the episode, which will broadcast in the spring.
According to The Sun, Wadia, who plays postmistress Zainab Masood in the BBC One soap, described working with Matt Smith as a "great" experience.
She added: "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."
Wadia joined the EastEnders cast in 2007 after rising to fame in the BBC comedy Goodness Gracious Me.
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