You love train, I love SF ;)

As on my first message ( https://www.steamgifts.com/discussion/gK8CI/first-message-any-advice-for-newbie-on-steam-andor-steamgifts ) you say you love train: here is a new one:

https://www.steamgifts.com/giveaway/?????/

1. Downcase, the second letter of that is most massively useful thing
2. Downcase, the last letter of the word finded in 1.
3. Upcase, first letter of the name of someone traveling in the Tardis
4. Downcase, first letter of the firstname of the president after the destruction of the colonies
5. Upcase, the first letter of what happen to the Formics

Please comment with your favorite SF book/game/movie

EDIT:

So here is the solution ;)

The most massively useful thing is a : towel
It is wrote in The Hitchhiker's Guide to the Galaxy
You may search in google for "most massively useful thing" to find this information
Or maybe check:
https://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy
https://en.wikipedia.org/wiki/Towel_Day

-1. o
-2. l

Tardis is the spacecraft of the Doctor Who
https://en.wikipedia.org/wiki/TARDIS
Nobody know the name of the doctor...
https://en.wikipedia.org/wiki/The_Doctor_(Doctor_Who)#Name

-3. So D or W ... It was W

The Twelve Colonies have been destroyed by the cylon attack
https://en.wikipedia.org/wiki/Battlestar_Galactica
In the 2004 serie, the president is Laura Roslin
https://en.wikipedia.org/wiki/Laura_Roslin
This one was not so easy (I think)

-4. l

Formics have been Xenocided by Ender Wiggin
https://en.wikipedia.org/wiki/Ender%27s_Game
It is the title of the third book:
https://en.wikipedia.org/wiki/Xenocide

-5. X

So final result is olWlX

So you know which are my favorite book and movie (and serie)
I will add Mass Effect as favorite SF game