Darillium
This picture is fanart because the planet was never actually pictured in the show. Credit to mikazukirisa.deviantart.com
PSA: River Song plot spoilers for this planet.
Darillium was the last place the eleventh Doctor took River Song before she would go on to "die" with the Tenth doctor in The Library.
As quoted from the wiki:
Darillium was the location of the Singing Towers. The Eleventh Doctor took River Song to see these towers the last time she saw him before she went to the Library and met the Tenth Doctor. She told the Doctor in the Library that "the last time I saw you - the real you, the future you, I mean - you turned up on my doorstep with a new haircut and a suit. You took me to Darillium to see the Singing Towers. What a night that was. The towers sang and you cried. You wouldn't tell me why, but I suppose you knew it was time. My time. Time to come to the Library.
Sounds rather romantic.
http://tardis.wikia.com/wiki/Darillium
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Midnight
Midnight was a resort planet, made up almost entirely of diamonds. It was colonized by humans, but the planet had no air, so the humans had to live in airtight structures which were dropped onto the planet from space. When the Doctor visited this planet with Donna Noble, he discovered that some other creature was capable of living on the barren planet. This creature "infected" one of the passengers on the Doctor's tour bus. When the Doctor tried to talk to her, she would just repeat whatever he said. As he spoke more and more, she started repeating things faster and faster until eventually, she was saying them
before the Doctor was. The Doctor was now infected. He could only repeat things said by others. All hell basically broke loose, and people wanted to throw the Doctor off the shuttle bus and to his death, but eventually the original infected lady was thrown out by a nice hostess, and the problem was solved.
Interesting note: this was the episode in which the Doctor first learned about the lost moon of Poosh (see below). Rose Tyler also briefly appears on a tv screen, but the Doctor does not notice. Both Rose and the moon of Poosh would make an appearance later in the series.
http://tardis.wikia.com/wiki/Midnight
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New Savannah
Not much to say here, other than that this planet was the home of a species of cat-people that came to distrust (and in extreme cases, kill) humans:
Circa 4,999,999,740, Catkind lived on the planet New Savannah. They were a primitive people at the time, and their natural resources were running low. The New Earth Empire came to New Savannah, and brought it and Catkind into the empire. They agreed to give the Cats autonomy until the year 5,000,000,000, when control would be given to the New Earth Empire. Within fifty years, Catkind had reached the same level of technology as the humans, and Catkind grew to distrust them. In order to avert a potential war, they left the Earth empire cities, which were then covered by empathic force fields, stopping any Cats from returning. Myths would spring up about these Cats, specifically about them being angry spirits.
In the intervening centuries, a cult sprang up to to oppose human influence. With the help of Bubastion, they destroyed the headquarters of Vedela Defense Systems, which controlled the force fields around the city. At the stroke of midnight at the start of 5,000,000,000, the forcefields were shut down and gigantic robots, disguised as undead Catkind, entered to the city. Unfortunately, Bubastion had programmed them to attack everyone, intending to use New Savannah for his own purposes. When Garrard Townsend, a member of the cult, learned they were being used, he turned the force fields back on and deactivated the robots.
Most of that story comes from comics (which I haven't read).
http://tardis.wikia.com/wiki/New_Savannah
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Poosh
A planet which has nice swimming pools. The Doctor would like to retire either on Poosh or in Paris.
At some point, one of its moons disappeared. This came to be known as the lost moon of Poosh. Turns out it was
taken by the Daleks, and they planned to blow it up, along with 26 other planets (along with Colm, one of the options of a previous night poll). Luckily the Doctor saved the day before that could happen.
http://tardis.wikia.com/wiki/Poosh
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Stormcage (Stormcage Containment Facility)
PSA: River Song plot spoilers for this planet.
Stormcage Containment Facility was a prison in the 52nd century of the highest security. River Song was a prisoner there and a frequent escapee, but always returned as her part of the charade to make the Silence think she actually killed the Doctor at Lake Silencio.
Though the staff were able to keep most of the prisoners in their cells, they failed endlessly with River Song. However, as she always returned after a breakout, they might have eventually given up on trying to stop her and left her to her own agenda.
It is located on a planet which is in a constant storm, and high-tech facial recognition cameras and trained guards help to keep the facility secure. Although not specifically confirmed in canon, it is believed by some that this entire planet is just a massive, unpleasant prison.
http://tardis.wikia.com/wiki/Stormcage_ ... t_Facility
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Vulcan (not the Spock one)
Planet colonized by humans for resources. Some guy found Daleks on it. The Daleks tried to kill the humans but barely failed. The Daleks who survived were deemed insane by the other Daleks and were sent to the Asylum of the Daleks.
http://tardis.wikia.com/wiki/Vulcan_(Th ... he_Daleks)
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Commentary
Pardon the short descriptions for the last few, I really must sleep. I think I summed up the important stuff though.
For the same reasons my commentary will be sort of brief:
Both Darillium and Stormcage are definitely linked with River. Don't know if she'd get some sort of benefit or power for going there or what. Between the two, Stormcage might be a better choice. I was thinking that Stormcage represents "hellos" while Darillium represents "goodbye." Idk about you guys but I don't want to say goodbye to River Song just yet.
I would avoid Poosh and Vulcan entirely because of the Dalek connotations. Even if Poosh
is allegedly a nice place to retire.
Midnight was a pretty scary episode because the mind parasite thing turned the good humans against each other--scaring them into making baseless accusations and ultimately almost killing the Doctor. Sounds like most of this game so far. Don't want to go there.
New Savannah would be a nice place for cat lovers. (Dana, bea: looking at you). I think cats are pretty cool so I think I'll stick my vote there for now. Hopefully it's not a trap. Only the radical cat cultists resorted to killing humans, and even then they stopped once they realized they were also killing their fellow cats. Might change it to one of the River Song options when I can think more clearly.
It's 2AM my time, but my internet died just after I loaded the Vulcan wiki page, so I guess I'll save this all to Word and try to post it in the morning.