Uncovering a plot to assassinate the Duke of Wellington at a ball held on the eve of Waterloo, Serena is killed when a shot intended for Wellington destroys both of her hearts, preventing her from regenerating. She is buried in a simple grave marked only with her name; SERENA. Once back on Gallifrey, the Doctor refuses to go on any more missions for the Agency unless various conditions are met, including the placing of Serena's name on the Gallifreyan Honour Roll, and that he be allowed to tell her family how she died.
