Michelle Claire Ryan (born 22 April 1984) is an English actress. She played the part of Zoe Slater on BBC soap opera EastEnders. In 2007, she starred in the short lived American television series Bionic Woman. She has appeared as the evil sorceress Nimueh in the 2008 BBC TV series Merlin, and as Lady Christina de Souza in the Doctor Who episode "Planet of the Dead"
In the fascinating novel Between The Lines, the idea is for Saul to become Isabelle Windlow, the daughter of a wealthy arms supplier. Reluctantly accepting the assignment, Saul puts himself into a task that could rewrite history. After the operation, he learns to adjust being a different person.