What do you think?
In 1994, two years before Quake, a revolutionary first-person shooter was already on the market. It was released for the Macintosh by the then-small-time developer Bungie, later to go on to fame and enormous fortune with Halo.
In Marathon you played as a security officer fighting tall, wiry aliens called Pfhor through a huge colony spaceship called the Marathon. Unlike its competitor Doom, Marathon was distinguished by a remarkably rich and well-written plot and mythology, featuring the ship’s mad (in Marathon parlance, “rampant”) artificial intelligence Durandal.
Marathon was also the first game to implement mouselook, which freed the player character to unkink his neck and look up and down as well as left and right, and which would become the standard control configuration for all PC shooters that came after it.