Quake was gaming perfection for a long, long time.
Quake was the world's first truly 3d first person shooter; you can thank id Software and this game for every addiction to modern online games. Seriously, without its advances in 3d gaming, World of Warcraft, Call of Duty and Counterstrike would all look like SpaceQuest and Doom.
You play a space marine, station at a government facility called the Slipgate Complex.
You play a Space Marine stranded on the alien planet Stroggos.
You can play a number of characters; aliens, monsters, space marines....
You play a space mar... Godamnit id!
Once again you can play as either a marine or an alien cyborg.