Series: 4

Original Air date: April 5, 2008

Number Doctor: 10th

Companion(s): Donna and Rose

Writer(s):   Russell T Davies

Director(s):  James Strong

Guest Stars
Sarah Lancashire as Ms. Foster
Bernard Cribbins as Wilfred Mott
Jacqueline King as Sylvia Noble
Verona Joseph as Penny Carter
Jessica Gunning as Stacey Campbell
Martin Ball as Roger Davey
Rachid Sabitri as Craig Staniland
Chandra Ruegg as Claire Pope
Sue Kelvin as Suzette Chambers

Synopsis: Independently of one another, the Doctor and Donna Noble are investigating Adipose Industries who claim to have created a revolutionary diet pill. The head of Adipose, Miss Foster, runs a pretty tight ship and they have been quite successful. Donna visits several people who have taken the pills and as advertised, the pills seem to be working. Except of course for the person that virtually vanishes, excerpt for a strange little creature in the bathroom sink. The Doctor and Donna join up eventually and come to the realization that there is definitely something alien behind what is going on.

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