3. Enemy Zero
Enemy Zero was a survival horror game set on board a spaceship and take more than a little inspiration from Alien. The gameplay was split between interactive FMV (ah, remember FMV?) sections and then first-person exploration sections. In these sections you would have to fight invisible aliens that could only be detected through sound and you had to fight them with a gun that had to be charged up at just the right moment or you left yourself open to attack. It made for some remarkably tense moments as the game encouraged stealth over action. It has aged quite badly in the looks department so could definitely do with a remake, though in practical terms that may prove difficult with original developer Warp having disappeared many moons ago, but there must be someone that Sega could get to tackle the project. https://www.youtube.com/watch?v=Wb0rFlht0G8