Episode Title: The Lazarus Experiment

Duration: 43 minutes and 27 seconds

Written by: Stephen Greenhorn

Directed by: Richard Clark

Transmission Date: 5th May 2007

Ratings: 7.2 million

Synopsis: Martha returns home as Russell T Davies' Doctor Who continues. Could this be the end of her travels with the Doctor? When she discovers her family is caught up in the scheming of Professor Lazarus and his Genetic Manipulation Device, it becomes a fight for survival, as human DNA twists into monstrous form.

Cast List: The Doctor — David Tennant
Martha Jones — Freema Agyeman
Tish Jones - Gugu Mbatha-Raw
Leo Jones - Reggie Yates
Francine Jones - Adjoa Andoh
Dr Lazarus — Mark Gatiss
Lady Thaw - Thelma Barlow
Party Guest - Lucy O'Connell
Mysterious Man - Bertie Carvel