Big Finish (in-universe)

Big Finish was a website open a Chrome tab on the human Osgood’s computer while on Zoom call and watching The Zygon Invasion with her Zygon self. (WC: The Zygon Isolation)

Behind the scenes

 * In the real world, Big Finish is a company that has produced Doctor Who audio stories, as well as several spin-offs, since 1998.