It's 1913 in England, and an ordinary schoolteacher called John Smith is disturbed by dreams of adventures in time and space and a mysterious blue box. But, when lights in the sky herald the arrival of something strange and terrible, Smith's maid, Martha, has to convince him that he alone can save the world.

• John Smith's journal features sketches of the interior of the TARDIS, a sonic screwdriver, K9, Rose Tyler, Autons, Clockwork Droids, Cybermen, Daleks, the Moxx of Balhoon and Raxacoricofallapatorians as well as a picture of the gas-mask plague carriers from "The Empty Child"/"The Doctor Dances". Also the First, Fifth, Sixth, Seventh, and Eighth Doctors appear,^[2] the first time in the new series that the previous incarnations have been explicitly acknowledged on-screen..
• As part of his cover story, John Smith refers to his parents Sydney and Verity, a reference to one of the creators and the first producer of Doctor Who respectively. Russell T. Davies confirmed this in Doctor Who Confidential.
• Fleeting clips of the lone Dalek in "Dalek", Cybermen, Ood, Sycorax, the werewolf seen in "Tooth and Claw", Racnoss and Lazarus in his mutated form are shown when Timothy opens the watch. There is also a clip of the Doctor using his sonic screwdriver in "Army of Ghosts" and "The Age of Steel".
• John Smith's skill with the cricket ball is reminiscent of that of the Fifth Doctor, best exemplified in Black Orchid.
• In the flashback the Doctor mentions a Time Agent vortex manipulator.
• The melody used while Lucy is walking down the path is similar to the melody used in Remembrance of the Daleks when the Girl appears.
• The Family's possession of Lucy Cartwright is a nod to the character of Aphasia in the original novel, a shapeshifting Aubertide who likewise takes the form of a young girl with a balloon.
• The Doctor explains he will cloak the pocket watch with a "perception filter". The Torchwood episode "Everything Changes" coined the phrase when stating that some of the TARDIS's properties became welded to Roald Dahl Plass due to the activities of the Cardiff Rift. In Torchwood, the perception filter cloaks the Torchwood Hub's lift from the untrained eye.

188 - 42
Doctor	David Tennant (Tenth Doctor)
Writer	Chris Chibnall
Director	Graeme Harper
Script Editor	Simon Winstone
Producer	Phil Collinson
Executive Producer(s)	Russell T. Davies Julie Gardner
Production code	3.7
Series	Series 3
Length	45 minutes
Originally broadcast	19 May 2007
Preceded by	The Lazarus Experiment
Followed by	Human Nature

Synopsis

In a distant galaxy, in the 42nd century, a spaceship hurtles out of control towards a boiling sun. The Doctor has 42 minutes to uncover the saboteurs, but with a mysterious force starting to possess the ship's crew, the Doctor and Martha are running out of time.

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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...

The Cult of Skaro's plan is in full force. Dalek Sec is reborn in a half-human form, and the Pig Slaves launch an enormous assault upon the Central Park Hooverville along with the remaining pure Daleks. The Doctor, Martha, Solomon and the others must fight for their lives, while the future of humans and Daleks alike is being decided underneath the Empire State Building.

186b - Evolution of the Daleks
Doctor	David Tennant (Tenth Doctor)
Writer	Helen Raynor
Director	James Strong
Producer	Phil Collinson
Executive Producer(s)	Russell T. Davies Julie Gardner
Production code	3.5
Series	Series 3
Length	45 minutes
Originally broadcast	28 April 2007
Preceded by	Daleks in Manhattan
Followed by	The Lazarus Experiment