Katherine is Tom's enigmatic and dedicated assistant. A psychiatric nurse, Katherine is the only person other than Tom who knows about his secret double life. She has the task of helping him lead it: the servant of two masters but only one man.
The role of Slater sibling Zoe in EastEnders in 2000 turned Michelle into a household name.
In February 2007, Michelle was cast as the lead in American drama, The Bionic Woman.
Other television appearances include Maria in ITV's Mansfield Park and Miss Marple.
Film credits include Flick, I Want Candy and Flashback.