I was very much into science when I was young - I wanted to be a marine biologist, then I wanted to be a doctor, and then something else, I was always changing.

In 2005 Freema Agyeman played Mary Ogden a scene of crime officer in an episode of Silent Witness. The production team were impressed by the versatility shown by Agyeman across her three auditions and called her back as a serious candidate for the new companion. Agyeman continued to portray the character Martha throughout every episode of the 2007 series.

Freema Agyeman (English pronunciation: /ˈfriːmə ˈɑːɡjəmən/ born Frema Agyeman on 20 March 1979) is a British television and film actress who is best known for playing Martha Jones in the BBC science fiction television series Doctor Who and its spin-off series Torchwood. Following her departure from Doctor Who and guest spots in BBC programmes Survivors and Little Dorrit Agyeman held a starring role as Alesha Phillips in the crime procedural drama Law & Order: UK between 2009 and 2012.