It is said that the worst enemies are those you can't see... never has this been more true than in Sega Saturn exclusive ''Enemy Zero.'' One of three games in now-defunct WARP's "[[VideoGame/{{D}} D Trilogy]]", the game has you playing as Laura Lewis, an amnesiac on a space station attacked by aliens. Seems like a fairly standard set-up, right? Well, the aliens are invisible. Not only that, but unlike most SurvivalHorror games, you only have one life to your name. Yes, one hit, and the game's over. Whether this is a challenge or a cheap shot is up to the player, and indeed opinions on this game are mixed, but for those interested, it's worth a shot.

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!!This game provides examples of:
* AdjustingYourGlasses: George pushes his up by the bridge.
* AirVentPassageway: Kimberly directs Laura to climb up into one of these to evade a pursuing alien. Certain rooms even include ladders so that she can reach them easier.
* AlmostDeadGuy: [[spoiler:David, courtesy of his true nature.]]
* {{Amnesiac Hero}}ine: Getting jolted out of cryosleep prematurely gave Laura a bit of amnesia. Kimberly implies she has a touch of it as well.
* AnyoneCanDie: It ''is'' a horror game, after all...
* ArtificialHuman: David [[spoiler:and Laura]].
* BarbieDollAnatomy: If you watched carefully the intro (or the ending), you can see that Laura's breasts are featureless.
* BerserkButton: George doesn't like anyone touching his computers.
* BittersweetEnding: [[spoiler:Laura escapes The Aki, and all the monsters are destroyed... but everyone else was killed. Save for David, who lives on as a program.]]
* BlackDudeDiesFirst: Parker, who dies during the introduction before you ever gain control of Laura.
* BorrowedBiometricBypass: Laura has to use [[spoiler:a chunk of Mercus' gibbed hand]] to pull this off.
* CheckPointStarvation: The Fall Tower on is largely a FirstPersonShooter, with only a couple of rooms where Laura can actually save her progress.
* DrivenToSuicide: [[spoiler:Kimberly ultimately kills herself next to Parker's corpse.]]
* DroppedABridgeOnHim: [[spoiler:Ronny]] dies offscreen between plot events, leading to a ScareChord when Laura goes to call them and the feed reveals [[spoiler:his corpse sprawled on the floor]].
* DullSurprise: The limited facial animation coupled with Laura's sparse voice acting makes her reactions to various horrors come off this way.
* EnemyDetectingRadar: The whole point of the game. All you have to detect the enemies is a soundpiece you put in your ear. The faster the chime, the closer the enemy. Note that picking up this item is ''completely optional''.
* {{Expy}}: Laura and George are [[Film/{{Alien}} Ripley and Ash]] respectively. [[spoiler: Only Ash is the human and Ripley is the robot.]]
* FaceFullOfAlienWingWong: [[spoiler:Poor Laura]] gets this at one point.
* GiantSpaceFleaFromNowhere: The [[spoiler:giant alien heart]] in the Fall Tower is never explained.
* GuideDangIt: In Kimberly's room, Laura has to [[spoiler:talk to David twice]] before Kimberly will react to [[spoiler:seeing Parker's corpse in his room]]. Even though [[spoiler:David doesn't say anything new the second time]]. And then you have to [[spoiler:talk to David one last time]] to trigger the next EventFlag.
* InvisibleMonsters: One of the primary gimmicks of the game.
* NoRangeLikePointBlankRange: The best way to ensure your shots don't miss the monsters is listening carefully and firing when they're right in front and coming straight at you.
* OffWithHisHead[=/=]YourHeadAsplode: The monsters' preferred method of killing people.
* OneHitPointWonder: Like actual humans, Laura qualifies for this, as does the rest of the crew...
** The enemies as well.
* OneWomanWail: Used when Laura discovers [[spoiler:Kimberly's suicide]].
* PosthumousCharacter: Since he's killed off right at the start, everything we know about Parker comes from Kimberly.
* ReusedCharacterDesign: David, Kimberly and Parker would go on to appear in ''[[VideoGame/{{D}} D2]]''.
* RelationshipSalvagingDisaster: David suggests that the incident ''could'' be this, claiming that Laura was rather cold to him before and rarely bothered calling.
* RidiculouslyHumanRobots: [[spoiler:Laura and David bleed and ''get bruises'', for Pete's sake! Granted, the point may have been to let them pass as human, but every single soul on the ship was apparently perfectly aware of their true nature.]]
* RoboticReveal: David's true nature is revealed when Laura sees [[spoiler:his mangled body in the basement]]. [[spoiler:Laura finds out about herself when she uses the body scanner.]]
* SaveGameLimits: Saving is presented as making an audio log on a handheld recorder, which starts with 64 charges on its battery. Saving uses up three charges, while loading uses one. Save or restart too much, and you may have to start all over... On top of this, the player cannot save during the FirstPersonShooter sections.
* SceneryCensor: In the opening sequence, where Laura wakes up from cryoslumber, the computer and other equipment around her are used to keep her modest.
* ShootTheShaggyDog: All Laura accomplishes when she tries to [[spoiler:save Kimberly]] is [[spoiler:getting to hear her kill herself]].
* ShowerScene: When you beat the game on Normal and started the game on Hard.
* StabTheScorpion: [[spoiler:Kimberly]] draws a knife, advances on Laura, and [[spoiler:slits the side of her throat -- freeing the alien worm gestating inside so she can shoot it without killing her friend]].
* StandardFemaleGrabArea: {{Subverted}} when [[spoiler:George]] grabs Laura by the wrist. Though the dialogue suggests he expects this to incapacitate her, she shakes him off and flees.
* SuddenlyVoiced: When loading a save, the usually quiet Laura will narrate the most recent plot events up to that point.
* TogetherInDeath: This is why [[spoiler:Kimberly refuses to leave with Laura when they're both in front of the escape pods]].
* TomatoInTheMirror: Laura discovers [[spoiler:she's actually an android, and was placed on The Aki to help capture the monsters so the company could sell them to the military for mad cash]].
* TrialAndErrorGameplay: Several puzzles require the player to simply experiment and hope for the best.
* VirtualCelebrity: Laura, who stars in all three of the ''VideoGame/{{D}}'' games, was designed with this in mind. The rest of the cast were also meant to be 'digital actors' like Laura.
* VoiceGrunting: Most of Laura's voice acting (outside of the Loading Logs) consists of sighs, grunts and gasps.

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