As one of the most influential First Person Shooters ever made, id Software's Quake is a definitive classic.
Taking influences from dark fantasy tropes, H.P. Lovecraft and science fiction, the story favours style over substance. A mysterious enemy code-named Quake opposes humanity, and the player is required to stop it with a copious amount of guns.
You play Sanjuro Makabe, a Mobile Combat Armor (MCA) pilot and Commander in
the UCA Security Force. The UCA was originally formed by three dominant
megacorporations (Andra Biomechanics, Armacham Technology Corporation, and
Shogo Industries). Originally intended as a joint venture that would ensure
the continued profitability of the three organizations that founded it, the
UCA is now independent, and the dominant military power in existence.