Question: Who met in the scene called "Time Crash" on the Doctor Who show?
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"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 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. 
"Time Crash" was filmed for the 2007 Children in Need appeal. 
One night, a spacecraft crash-landed in Blackcastle, bringing with it the intergalactic tyrant Beep the Meep.
The Meep was fleeing the galactic law enforcers called the Wrarth, but he used his appearance as a cute, furry alien to gain Sharon's sympathy.
Sharon sheltered Beep for a time, and it was while doing this that she met the Doctor.
Beep's ruse was eventually uncovered and he was handed over to the Wrarth, and the Doctor prepared to take Sharon back to Earth.
However, at this time the TARDIS was being particularly unreliable, so the Doctor and Sharon shared several adventures on the way.
Together with the Doctor, Sharon faced the Daleks, the Sontarans and Brimo the Time Witch, among others.
During the encounter with Brimo, a fault in the TARDIS's chrono-compensator made everyone in the time machine age four years in an instant while passing through a time rift.
While this did not affect the Doctor significantly, Sharon was suddenly in her early twenties.
Not having been fond of being an adolescent, however, she was quite pleased with the results.
Eventually, Sharon and the Doctor arrived on the planet Unicepter IV.
Since the Doctor's last visit, a new fad of dreaming had arisen, with professional dreamers who would construct dream worlds in which groups of people could participate in a shared fantasy.
This was facilitated by the Slinth, telepathic sloth-like creatures that perched on the dreamers' shoulders and made it possible to connect multiple minds to a single dreamer.
It transpired, however, that the Slinth were actually psychic vampires, and had been leeching energy off the minds of the dreamers until they were strong enough to mass for an attack.
During these events, Sharon met a dreamer named Vernor, and after the Doctor defeated the Slinth, she chose to remain behind on Unicepter IV to be with him. 
The title of the episode is a play on words, referring both to the introduction of the eleventh Doctor and to the fact that he was nearly too late, the connotation of the phrase.
In the DVD commentary, Moffat said it was originally titled "The Doctor Returns", and that it was the most difficult script he had ever written, as he had to introduce a new Doctor, a new companion, convince the audience that it was both a new and an old show, and deliver a fast-paced story.
While traditionally the Doctor rests after he regenerates, Moffat thought it would be fun to make him save the world instead.
He described it as a comedy of a man whose day keeps getting worse and worse.
Believing that London and companions from London had become a "cliché" and the audience had " bored of it", Moffat set the episode in the fictional village of Leadworth.
Moffat, a Scot, debated whether to locate the episode in a village in Scotland.
He ultimately decided on England, in keeping with the notion of Amelia as an unconventional girl.
Throughout the episode, the Doctor behaves erratically, as he gradually gets used to his new body and tastes while developing a new personality.
Willis stated that he "finally clicks into place" after picking out his new outfit.
The rooftop scene was not in the original script; the Doctor simply ran away from the ward and returned to the TARDIS.
Moffat felt that he did not really have a formal introduction, and that more could be made of the costume, as many previous Doctors had picked theirs out quietly.
The main story arc is the Doctor meeting the grown-up Amy.
Moffat felt that over time the relationships between the Doctor and his companions had become too adult.
He wanted to create a childlike relationship like that between Peter Pan and Wendy, rather than boyfriend and girlfriend.
He believed this was the kind of relationship viewers had with the Doctor, regardless of their age.
When the Doctor returns for Amy, she is a very different person from the seven-year-old he had met before.
Moffat explains that she developed a "tough" element and had become "distrustful" and "cynical" due to him not returning as promised, forcing her to accept that he was an "imaginary friend".
Rory was "completely in love" with Amy, but Amy wanted adventures before admitting she loved him, too.
Moffat described Rory as someone who had grown up in the "shadow" of Amy's imaginary Doctor.
Moffat was inspired by a crack in his son's bedroom wall and developed the idea into the main story arc for the fifth series.
He thought that a child might think that something interesting lived inside such a crack.
The hidden room in Amelia's house was based on Moffat's recurring childhood dream of a nonexistent hidden room in his grandmother's house.
Moffat was keen to give the monster a giant eyeball, and commented that the Atraxi's design — a giant eyeball on a star — was easy for children to draw, as he used to draw "Doctor Who" monsters as a child.
These aspects reflect "Doctor Who" "domestically-scaled menace" principle.
Moffat wrote a scene that explained Prisoner Zero's crime, but cut it because he figured no one would care.
The opening sequence, in which the Doctor barely hangs onto the crashing TARDIS as it flies over London, was later added to the script to bridge from the conclusion of "The End of Time" to the TARDIS's crash into Amy's garden.
Moffat thought it would be "funny" if they showed him hanging out of the TARDIS and nearly crashing into London, which would start an episode set in a small town in a big way.
Moffat also referenced the scene from A.A. Milne's "The House at Pooh Corner", where Tigger claims to like everything, but then proceeds to reject all food offered to him until he finally finds that he likes extract of malt.
Moffat's variant had the newly regenerated Doctor reject a variety of foods, with the exception of fish fingers with custard, offered to him by the young Amy.
Moffat felt that appealing to children was important to the show's success.
The scene where the Doctor creates the virus using Jeff's laptop was originally set in a classroom where the Doctor used the students' computers; this was changed for production reasons.
In the episode, the Doctor snaps his fingers to open the TARDIS, a trick his previous incarnation learned from River Song in "Silence in the Library"/"Forest of the Dead".
He also repeats the lines "wibbley-wobbley, timey-wimey" and "some cowboys in here" from the Moffat-written episodes "Blink" and "The Girl in the Fireplace". 
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