Sara Powell (born 23 June 1968) is a British-Jamaican stage, screen and voice-over actress and audiobook narrator. Her regular television roles include crown prosecutor Rachel Barker in the BBC's police procedural drama HolbyBlue (2007–2008), driver Sally Reid in ITV's firefighting drama London's Burning (1993–1994) and psychologist Cass in Channel 4's sitcom Damned (2016–2018). She also played historical figure Mary Seacole in the thirteenth series of the BBC One long-running science fiction se ...