Lady Christina de Souza (Michelle Ryan)

Lady Christina de Souza, a notorious thief who stole for the thrill of it, being bored with her aristocratic life...very Tomb Raider!

Michelle Ryan spotted filming in Cardiff

Damn, nom nom nom, don't mind me, I'm just eating my hat.

Filming on the streets of Cardiff was former Bionic Woman Michelle Ryan, who was wrapped up in a sleek leather jacket to play the mysterious Lady Christina de Souza in Doctor Who. The 24-year-old actress, who shot to fame in the BBC1 soap EastEnders playing Zoe Slater from 2000 until 2005, was decked out all in black as she filmed an episode of the cult sci-fi hit at a secret Cardiff location on Thursday night.
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Michelle Ryan could be the next assistant

The former Eastender and Bionic Woman could be the next assistant according to the Mail Online. But if you believe that Blatt you'll believe anything :-)