10 Best Sci-Fi Video Games You've Never Played

Many years before Bungie would become synonymous with Triple-A titles like Halo, the developer released a first-person shooter that was way ahead of its time. Marathon was released in 1994 for the Apple Macintosh, and it was a game-changer, thanks to the introduction of several elements now common in first-person shooters.

Gameplay is set hundreds of years in the future aboard a colony ship called Marathon. The player is a security offer, who must defend the ship and all of its inhabitants from an alien invasion intent on their destruction. The storyline was well-developed and a major element of gameplay.

Most FPS' from the early '90s didn't put as much emphasis on the story as much as Marathon. Doom, for instance, had almost no storyline and was entirely focused on action, but Marathon flipped the script and stood apart from the competition by being innovative in this area. It also featured a deathmatch mode allowing eight players to kill one another at once, which was a lot in those days.

Marathon is the first in a trilogy and has since been released as freeware by Bungie, so you can still play it. It's one of those titles that may not look good compared to modern FPSs, but diving into its intricately detailed lore keeps it highly entertaining, so it warrants your attention.