Clara is lost in the depths of the sentient spaceship and time machine the TARDIS after its engines become damaged by the salvage crew's beam.

The Doctor awakes to find himself on the salvage ship, manned by the Van Baalen brothers: Gregor, Bram, and Tricky.

[5] Also changed was a scene in which Clara explores a room of discarded possessions from earlier companions; this was simplified to her discovering Amy Pond's toy TARDIS and the Doctor's cot.

[4] The final shot was the scene where the Doctor and Clara enter the defensive front of the TARDIS's engine room, which was filmed on 28 November at the Argoed Isha Quarry in the Vale of Glamorgan.

[6] Guest star Ashley Walters came into conflict with the producers on his first day of filming when he tweeted a picture of himself in his costume in his trailer with the word "space".

[9] When final ratings were calculated, the figure rose to 6.5 million, the seventh most-watched programme of the week on BBC One.

Dan Martin of The Guardian felt that the ending would upset fans for "audaciously" mocking them and that the episode "frustratingly ... advances the arc before striding right back to square one".

[13] Digital Spy's Morgan Jeffery gave the episode five out of five stars, describing it as "an absolute treat for Doctor Who fans" as well as casual viewers, and said that the resolution was "not just a running gag but a timey-wimey, reset twist that actually works on a logical and a dramatic level, and doesn't feel like a cheat".

[15] Radio Times reviewer Patrick Mulkern described the episode as "a reasonably entertaining, playfully timey-wimey adventure, with lots of nice touches".

While he praised the set design and the performance of Coleman, he wished for a more consistent style of the TARDIS as seen in the classic series and called the three brothers "a singularly inept bunch of clods".

[16] Neela Debnath of The Independent wrote that the episode was "fun" but mostly "an excuse to explore the [TARDIS]", with an insubstantial plot and three supporting characters who were difficult to care about.

He particularly criticised the plot for being "average" and "a reasonable, bog-standard, sci-fi corridor run-around complete with handy-dandy reset button ending".

[18] Gavin Fuller of The Daily Telegraph gave the episode one and a half stars, also finding "wasted opportunities" and that it seemed "like a rehash of old Who".

Fuller wrote that "the only redeeming feature was the spiky development of the Doctor/Clara relationship" but felt that this "was nowhere near enough to save this deadly dull episode".

However, he complained that the episode lacked nuance or subtlety, and described the Van Baalens as "the show's most poorly acted siblings since the Sylvest twins" and the revelation of Tricky not being an android as one of the "all-time stupid Doctor Who plot points".

However, he admitted "Murray Gold's superlative soundtrack holds it together", and later described the story as "big, loud, dumb fun".