For this week's quiz, I thought I'd throw out a list of races and see if you can remember what each one is from. I intentionally left out all the Star Wars and Star Trek races, since I think people would find Twi'lek and Bajorin a bit too easy.
I recognized Xur in Xurian from The Last Starfighter, but I thought a Xurian was a follower of Xur as opposed to a race and figured you were referencing something else. In fact, I'm still not convinced that Xurian is a race. If it is, poo-poo on the writer for being unoriginal and confusing.
Skeksis - Dark Crystal
Githzerai - Dungeons and Dragons
Murloc - Warcraft
Rockbiter - Neverending Story
Luxan - Farscape
Horned Reaper - Dungeon Keeper
Zentradi - Battletech
Sontaran - Doctor Who
Vortigaunt - I was thinking Commander Keen and the Invasion of the Vorticons