Arriving back on Earth, Martha, the Doctor and Martha's family attend a demonstration by the enigmatic Professor Lazarus which promises to change "what it means to be human". A horrific product of genetic manipulation goes on a rampage, and the machinations of an unseen trap start to close.

187 - The Lazarus Experiment
Doctor	David Tennant (Tenth Doctor)
Writer	Stephen Greenhorn
Director	Richard Clark
Script Editor	Simon Winstone
Producer	Phil Collinson
Executive Producer(s)	Russell T. Davies Julie Gardner
Production code	3.6
Series	Series 3
Length	45 minutes
Originally broadcast	5 May 2007
Preceded by	Evolution of the Daleks
Followed by	42

"My name is Professor Richard Lazarus, and tonight, Mathew I am going to be... miracle...