"Wild Blue Yonder" is the second of the 60th anniversary specials of the British science fiction television programme Doctor Who.

Set directly after the events of "The Star Beast", the episode focuses on the Doctor and Donna being stranded by the TARDIS on an abandoned spaceship at the edge of the universe, where they encounter a pair of sadistic, shapeshifting duplicates of themselves.

The episode was watched by 7.14 million viewers and received positive reviews from critics, with praise being directed toward the performances of Tennant and Tate.

A novelisation of the episode was written by Mark Morris, which was then turned into an audiobook read by former companion actress Bonnie Langford.

As Donna and the Doctor quickly exit, it spews flames while playing "Wild Blue Yonder", then shuts down.

The Not-Doctor – as clever as the Doctor now  – realises the trap is a very slow self-destruct sequence intended to kill them, and that the robot is the trigger.

[1][2] Before the episode was broadcast, director Tom Kingsley made a statement attempting to calm speculation,[3] and afterwards Davies explained that the secrecy was because it was "the simplest of the lot", as he had scrapped all other concepts in order to focus on the core premise of Tennant and Tate's characters being alone with the Not-Things on the spaceship.

[10] Tennant and Tate used physical props to simulate the inhuman aspects of the Not-Things, such as plastic teeth and an oversized controllable arm.

[14] George Cheetham acted as a stunt double for David Tennant, with floor runner Helen Langford standing in for Catherine Tate.

[15] Additional doubles included Daniel Tuite, Ophir Raray, and Tommaso de Vincenzo for Tennant, and Helen Cripps for Tate.

[16] Contortionist Tommaso Di Vincenzo portrayed the Not-Thing mimicking the Doctor in a scene where the creature bent double backwards.

[6] Filming was done entirely on set, with large amounts of green screens and VFX work done to show the pair being on board the spaceship.

[6] For the London plane crash scene, a smoke cannon was used to simulate the appearance of air being propelled from a long distance away.

The site's consensus reads "'Wild Blue Yonder' gets real weird with the formula, and yet it hits home as classic Doctor Who with its heartfelt attention paid to the characters.

"[20] The Guardian's Martin Belam rated the special a 4/5, describing the acting as "impeccable" and further praising the visual effects.

[16] Richard Edwards of Total Film praised the episode, highlighting the performances of Tennant and Tate, as well as Davies's writing.

[31] Samantha Coley of Collider praised the performances of Tennant and Tate, highlighting the horror elements and character work done in the episode, though criticized some of the CGI used for the Not-Things.