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Time Crash

Time Crash is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Time Crash rather than just read about it. In short: "Time Crash" is a mini-episode of the British science fiction television series Doctor Who. It was broadcast on 16 November 2007, as part of the BBC One telethon for the children's charity Children in Need.

Time Crash — main illustration
Time Crash — illustration

Key takeaways

  • Time Crash belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Time Crash to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Time Crash from memory before moving on to harder problems.

Reference excerpt

"Time Crash" is a mini-episode of the British science fiction television series Doctor Who. It was broadcast on 16 November 2007, as part of the BBC One telethon for the children's charity Children in Need. Written by Steven Moffat, it starred David Tennant and brought back Peter Davison as the Doctor. The episode, set during the last scene of the previous episode "Last of the Time Lords", depicts a humorous encounter between the Doctor's fifth and tenth incarnations, played by Davison and Tennant respectively. "Time Crash" was praised by critics who reviewed the episode, and was a ratings success; it was the most-viewed show of the night, and briefly the most-viewed episode of Doctor Who since 2005, with 11 million viewers.

Plot The Tenth Doctor tries to take off in the TARDIS after saying goodbye to Martha Jones, only for the time machine to spin wildly and sound an alarm. Checking out the systems, the Doctor suddenly collides with his fifth incarnation, who is doing the same thing. The Tenth Doctor recognises his past self and is delighted to see him, gently poking fun at his particular eccentricities. However, the Fifth Doctor is annoyed, thinking that his counterpart is a "fan" who has somehow broken into the TARDIS. The Doctors discover that the same TARDIS at different points in time have collided because the Tenth Doctor left his shields down. This creates a paradox that will cause a black hole strong enough to swallow the entire universe. The Tenth Doctor counters it with a supernova, a solution he remembers seeing himself perform in this same incident (a predestination paradox), making the Fifth Doctor realise the Tenth Doctor really is his future self. The Tenth Doctor reminisces as the Fifth Doctor begins to fade into a separate timeline, revealing various traits from his fifth incarnation that he retained for his tenth, and wishes him well. As the time streams split, the Fifth Doctor calls out, warning the Tenth to put his shields up. The Titanic collides with the TARDIS.

Production The episode was first conceived by executive producers Julie Gardner and Russell T Davies, who decided to air an interstitial scene for Children in Need 2007. Gardner asked Steven Moffat to write the special, with the stipulations the scene could be shot in one day and one set, and require no CGI effects. Peter Davison was approached to reprise his role as the Fifth Doctor in July 2007, and accepted the role to impress his children. The episode was officially announced by the BBC on 21 October. Moffat's script started by repeating Martha's departure. The script indicated that "this time, we stay with the Doctor. As before ... the Doctor takes a moment, then slam the controls," and described the Fifth Doctor as having a "frock coat, cricket jersey, and a stick of celery on his lapel". Moffat included several references to Fifth Doctor stories in his script: the Tenth Doctor commented about the Fifth Doctor's attire and his disuse of the sonic screwdriver. A line about the effects of the paradox the TARDIS collision had caused gave an explanation of why the Fifth Doctor looked far older than normal, addressing that Davison had left the role over twenty years before. The Tenth Doctor refers to Tegan Jovanka, Nyssa, the Cybermen stories Earthshock (1982) and "The Five Doctors" (1983), the Mara serials Kinda (1982) and Snakedance (1983), the Time Lords' "funny hats" from Arc of Infinity (1983), and the various Master stories during Davison's tenure. "Time Crash" was filmed at Upper Boat Studios in Upper Boat, Cardiff, as part of the fourth recording block of the fourth series (which included "Partners in Crime") on 7 October 2007. Graeme Harper, director of Davison's final serial The Caves of Androzani (1984), directed the episode. To replicate the Fifth Doctor's attire, the production team borrowed items from the Doctor Who exhibition in Blackpool and knitted a new cricket jumper to reflect the style worn from Castrovalva (1982) to Warriors of the Deep (1984). The accompanying Doctor Who Confidential episode revealed that the trousers Davison wore in "Time Crash" were the same pair that Colin Baker wore in his early scenes in The Twin Dilemma (1984).

Broadcast and reception Previous Doctor Who charity specials transmitted over the years include Dimensions in Time, Doctor Who and the Curse of Fatal Death and the untitled 2005 special. The anniversary special "The Five Doctors" was broadcast on Children in Need night for its United Kingdom premiere broadcast. The Children in Need telethon was the most-watched television programme of the night, with a final rating of 9.6 million viewers, and figures peaked between 8:15pm and 8:30pm, when "Time Crash" was aired, with a total of 11.0 million viewers. The episode was therefore the most-viewed since the show's revival in 2005, surpassing the revival's premiere, "Rose", which achieved a rating of 10.8 million viewers. Donations also peaked during the episode's airing. When the episode was replayed four hours later, it garnered an audience of 2.5 million viewers. This rating was later beaten by "Voyage of the Damned", which received 13.3 million viewers. The episode was positively reviewed by critics. Martin Conaghan of TV Squad expressed the belief that the episode was "the highlight of the evening". He mainly complimented Moffat for his writing; he said that Moffat "has a knack for clever paradox-style stories, and managed to capture a fantastic little snippet of emotion, harking back to the early days of Doctor Who," specifically praising the farewell scene. Dek Hogan of Digital Spy mirrored Conaghan's beliefs; he called Moffat's script "witty" and hoped that Davison would return to film a full-length episode.

References

External links

Time Crash on Tardis Wiki, the Doctor Who Wiki "Time Crash" at the BBC Doctor Who homepage "Time Crash" at IMDb Watch "Time Crash" on the BBC YouTube Channel (not available for every country)

Worked examples

Example 1 — a first encounter with Time Crash

Start with the simplest possible case. Write down what Time Crash claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Time Crash before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Time Crash ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Time Crash

In research
Time Crash appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Time Crash in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Time Crash is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2007 British television episodes, Children in Need, Doctor Who charity episodes, so understanding it makes those chapters shorter.
In everyday life
Look for Time Crash outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Time Crash in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Time Crash means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Time Crash out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Time Crash in simple terms?

"Time Crash" is a mini-episode of the British science fiction television series Doctor Who. It was broadcast on 16 November 2007, as part of the BBC One telethon for the children's charity Children in Need.

Why does Time Crash matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Time Crash?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Time Crash.

Tags

  • 2007 British television episodes
  • Children in Need
  • Doctor Who charity episodes
  • Doctor Who mini-episodes
  • Doctor Who multi-Doctor stories
  • Fiction about black holes
  • Fiction about supernovae
  • Fifth Doctor serials
  • Television episodes written by Steven Moffat
  • Tenth Doctor episodes
  • Two-handers

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