Fenwick told the official EastEnders website: "Like Billy, I am also terrified at what might go wrong as I carry the Olympic torch though Albert Square. Filming this was like a dress rehearsal of my worst nightmare!
"It was strange filming at West Ham as again, like Billy, I feel it's my home. I'm over the moon to be carrying the torch through Walford, and working with the likes of Dame Kelly Holmes has made me even more excited to do so!"
The Red Button mini-drama will become available to view straight after the regular EastEnders episode on July 16.