"Partners in Crime" is the first episode of the fourth series of British science fiction television series Doctor Who. It was broadcast on BBC One on 5 April 2008 at 6:20pm.
Catherine Tate reprises her role as Donna Noble, who previously appeared in "Doomsday" and "The Runaway Bride". In the episode, Donna and the Doctor (David Tennant) meet while separately investigating Adipose Industries, a company creating a revolutionary diet pill. Together, they attempt to stop businesswoman Miss Foster (Sarah Lancashire) from killing thousands of people in London during the birth of the Adipose, short white aliens made from body fat.