Anna-Louise Plowman played Diana Goddard in the Doctor Who television story Dalek and Dr. Jennifer Harrison in The Helliax Rift. She is also known for her role(s) as Dr Sarah Gardner and the Goa'uld Osiris in Stargate SG-1. Born into a New Zealand family, Plowman attended the London Academy of Music and Dramatic Art. She married actor Toby Stephens in London in 2002 and so has actress Maggie Smith as her mother-in-law and Chris Larkin as her brother-in-law.