[[quoteright:206:http://static.tvtropes.org/pmwiki/pub/images/RE0_Billy_and_Rebecca_4381.PNG]]
[[caption-width-right:206:[[Creator/SamuelLJackson Enough is enough! I had it with these motherfucking zombies]] [[Film/SnakesOnAPlane on this motherfucking train]]!]]

'''''Resident Evil Zero''''', the fifth main game in the ''Franchise/ResidentEvil'' franchise, came out for the UsefulNotes/NintendoGameCube in 2002. It serves as a prequel to the original ''[[VideoGame/ResidentEvil1 Resident Evil]]''. Creator/{{Capcom}} initially slated this game for the UsefulNotes/{{Nintendo 64}} as a follow-up to that system's port of ''VideoGame/ResidentEvil2'', but scrapped the original version of ''Zero'' halfway through development when Creator/{{Nintendo}} unveiled their next console (the [=GameCube=]). Capcom made the decision to move ''Zero'' from a dying platform to the next generation instead; at the same time, Creator/ShinjiMikami's team began development of a remake of the first ''Resident Evil'' (better known as the ''[=REmake=]'') for the [=GameCube=]. The development of the two projects overlapped, which led to both games sharing many of the same assets (chiefly the character model for Rebecca Chambers). As a result, development on ''Zero'' finished only a few months after the release of the ''[=REmake=]''. For more than a decade, ''Zero'' was exclusive to Nintendo platforms, as its only port was on the original UsefulNotes/{{Wii}} in 2008. However, on May 25, 2015, Capcom announced the ''Resident Evil Zero HD Remaster'', and it was released for the UsefulNotes/{{PlayStation 4}}, UsefulNotes/XboxOne, UsefulNotes/{{PlayStation 3}}, UsefulNotes/{{Xbox 360}}, and PC on January 19, 2016.

Bravo Team, one half of the Raccoon Police Department's elite [=S.T.A.R.S.=] unit, heads into the Arklay Mountains to investigate the reports of recent "cannibal murders", but a mechanical failure brings their helicopter down. The team searches the nearby area and discovers a crashed military police van; it contains the van's murdered drivers and a transport log for former Marine Lieutenant Billy Coen, a convict scheduled for execution after committing twenty-three murders. After Bravo Team [[LetsSplitUpGang separates to find Billy]], new team member Rebecca Chambers finds her way to a broken-down train, the Ecliptic Express, in the middle of a forest.

Rebecca has incredible luck for her first day on the job: she not only encounters Billy, but also ends up face-to-decaying-face with scores of zombies, who force Rebecca and Billy to work together in order to survive. The duo escapes the train, then head down the tracks, where they discover the Umbrella Management Training Facility. Their struggle for survival pits them against hordes of Umbrella's nightmarish bio-weaponry [[spoiler:and the mysterious Dr. James Marcus, who bears his own grudge against Umbrella.]]

''Zero'' employs a character-switching system where the player controls both Rebecca and Billy throughout a single playthrough: the player can either have Billy and Rebecca explore the same areas together, with one character controlled by the player and the other by the computer, or split them up. The knowledge of when to stick together or split up becomes integral to solving many of the puzzles. The game also eliminates the series staple of item boxes; Rebecca and Billy can instead drop their items anywhere and later retrieve them from the same locations.

''Zero'' became the last game of this franchise to utilize pre-set camera backgrounds and exploration-oriented game design; ''VideoGame/ResidentEvil4'' marked the series' [[ActionizedSequel shift towards action and shooting]].

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!! ''Resident Evil Zero'' contains examples of the following tropes:
* TwentyThree: Billy was convicted of killing 23 people.
* AcademyOfEvil: The Umbrella Training Facility. The place basically exists to instill unswerving loyalty to the company and has its students conducting the unethical experiments the company is famous for. Furthermore, this was the school where series villains [[spoiler: Albert Wesker and William Birkin]] got their start.
* ActionGirl: Rebecca, sort of. She's certainly much braver and more capable then her [[DistressedDamsel earlier/later self]] from ''Resident Evil''. Easily justified considering that by that ''Resident Evil'', she's been up for several days straight and is running on nothing but fear and adrenaline in the middle of a ZombieApocalypse. However, in ''[[{{VideoGame/ResidentEvilTheUmbrellaChronicles}} The Umbrella Chronicles]]'', we find out she has at the very least had a nap.
* AlwaysClose: No matter how quickly you get to Rebecca, she is always saved just in time when she's dangling from a ledge.
* AndThenJohnWasAZombie: Edward Dewey becomes a zombie shortly after being killed by zombie dogs, while [[spoiler:Dr. Marcus becomes the Leech Queen.]]
* AndYourRewardIsClothes:
** Rebecca gets her cowgirl ensemble from ''[=REmake=]'', plus a new leather outfit, while Billy gets a fancy suit. Since the closet is located only in the Ecliptic Express, it becomes impossible to change outfits after reaching the Training Facility.
** Continued in the ''Remastered'' edition, although there are a couple differences. One, you're given a second personal item in the form of a Suitcase, from which you can change costumes at any time right from the start. Second, there are a number of costume packs available as DLC, which is currently total of eight costumes, not counting the seven T-shirt designs for Rebecca. Billy is given the option to cosplay as Cody from ''[[VideoGame/StreetFighterAlpha Street Fighter Alpha 3]]'' or a Wolf Force member (specifically Joseph Gibson) from ''[[VideoGame/{{Commando}} Mercs]]'', while the other six are Rebecca's outfits from other games: her original outfit from the first ''Resident Evil'' (S.T.A.R.S. 1996), her Arrange Mode outfit from ''Director's Cut'' (S.T.A.R.S. 1997), her outfit from the unreleased [=N64=] version of ''[=RE0=]'' (S.T.A.R.S. Prototype), her RPD basketball uniform from the hidden photo in ''[=RE2=]'', her cheerleader outfit from ''Deadly Silence'', and her sexy nurse costume from ''Mercenaries 3D''. The game also adds a "Wesker Mode" that replaces Billy with Wesker and gives Rebecca an EvilCostumeSwitch similar to Jill's in ''[=RE5=]''.
* AntiFrustrationFeatures: Believe it or not, the game actually seems to assess your ammo and health upon entering a room and and will allow enemies to be killed much more easily if you're low on health/ammo.[[note]]This is not the case in Hard mode for obvious reasons.[[/note]]
* AscendedExtra: William Birkin finally gets some screentime in a non-monster form.
* AwesomeButImpractical: The Hunting Gun. Powerful, but it only holds two shells at a time and takes up two precious inventory spaces like most of the other heavy weapons. Most players will likely dump it for good not long after reaching the Training Facility, seeing as the other shotgun can be found relatively quickly which can hold five more shells.
* {{Badass}}: Billy, a former Marine. In ''The Umbrella Chronicles'', he uses his handcuffs as makeshift brass knuckles, and is also capable of drop kicking a full grown man in the face.
* TheBadGuyWins: The Mysterious Young Man claims he wants to destroy Umbrella, [[spoiler: and by causing the viral outbreak in the Spencer Estate and bringing attention to Umbrella]] he got exactly what he wanted. He also wants to set the world on fire, which is hard to deny is happening by ''VideoGame/ResidentEvil6'', again in part due to him. The only thing he probably didn't want was [[spoiler: getting killed by Rebecca and Billy.]]
* BehindTheBlack: Inverted with the leech zombies purely for shock and surprise. There's a few rooms you'll enter and the layout of the room means the leech zombie ''should'' see you as soon as you're in the room, but it won't start attacking until the camera angle changes to show it. At which point, the ScareChord and PsychoStrings start up.
* BareYourMidriff: Rebecca's bonus outfit.
* BigCreepyCrawlies: The bosses include a giant scorpion and a giant centipede. The regular monsters include the smaller-but-still-giant insects, the Plague Crawlers, and the Spiders (though there are only five of them in the game). And let's not forget all the leeches.
* BodyHorror: [[spoiler:Dr. Marcus]] is probably the best example. There's just something repugnant about a guy vomiting several dozen fist-sized black leeches and copious amounts of slime, after which they crawl all over him and ''fuse'' with him to change him into the Queen Leech.
* ChainedByFashion: Billy only managed to break one arm free when his truck overturned and spends the entire game with his cuffs hanging off of his left wrist.
* ClownCarGrave: Justified in that not all corpses reanimate at the same time and there were dozens of people on the train when it was attacked. You can see corpses still in their seats or lying on the floor all over the train, so it makes sense that the "fresh" zombies are passengers finally completing their reanimation and shambling off to hunt.
* ContinuityNod:
** Rebecca at one point visits the turntable and the entrance to Birkin's lab from ''VideoGame/ResidentEvil2'', which establishes that the cable car ride in ''[=RE2=]'' took a lot longer and covered a lot more ground than anyone thought before this game was released.
** The opening text crawl goes out of its way to not only mention Raccoon City and [[VideoGame/ResidentEvilCodeVeronica Rockfort Island]], but also Sheena Island from ''[[VideoGame/ResidentEvilGunSurvivor Resident Evil: Survivor]]'' as locations of T-Virus outbreaks.
** A subtle one. Rebecca is unable to operate the piano to get the battery, justifying why she had to practice in the first game.
** The ''HD Remaster'' gives the achievement/trophy [[MasterOfUnlocking "Apprentice of Unlocking"]] after you open the last locked door in the game that leads to the final boss fight.
* CoolTrain: The Ecliptic Express is a ridiculously luxuriant train, complete with private cabins and a restaurant, all to ferry Umbrella employees between Raccoon City and the Research Center, which has to be a couple of hours long trip at best.
* CreepyCentipedes: Centurion, who's big enough to devour people whole.
* CutscenePowerToTheMax:
** Billy diving into {{bullet time}} while shooting the leeches off Rebecca.
** Rebecca gets her own when she ''ducks'' through an otherwise typical InsurmountableWaistHeightFence.
* DeadlyGaze: In the 2016 remaster, Wesker gets this as a special attack in "Wesker Mode", along with his superspeed dash. It's not really consistent with his established powers, and was most likely implemented because super-strength punches couldn't be properly animated within the context of ''[=RE0=]'''s engine.
* DeathFakedForYou: [[spoiler: Rebecca allows Billy to escape at the end by falsely reporting his death.]]
* DemotedToExtra: The zombie dogs make just two appearances during the entire game, and only on the train.
* DoomedByCanon: Sorry Rebecca, but [[VideoGame/ResidentEvil1 that mansion]] is not going to be a reprieve.
* DoorToBefore: You don't deposit spare items in the item box anymore. You just drop them on the ground and have to backtrack to pick them up. To make this easier, nearly every stage of the game has shortcuts that let you go back to an earlier part of the game. Except the train, obviously, though any items you left on the train end up on the floor in the room where the train crashed.
* DoubleUnlock: Getting an E rank, which is as easy as picking up a single leech charm, in the Leech Hunter minigame will unlock bonus submachine gun ammo in the main game. However, actually getting your hand on the submachine gun requires you to beat the main game with either an S or A rank, and you can't play on easy mode.
* EasyModeMockery: Beating the game on easy will not unlock the special weapons.
* EpisodeZeroTheBeginning
* EverythingsBetterWithMonkeys: Horribly averted with the Eliminators, psychotic albino apes that make very good DemonicSpiders.
* EvilLaugh: [[spoiler:Dr. Marcus]] is quite fond of this.
* FakeLongevity: In Leech Hunter, each rank offers different rewards. In the [=GameCube=] and Wii versions, each rank has to be obtained individually. For example, getting an A, by collecting all 100 leech charms, only unlocks the infinite ammo for all weapons in the main game. Thankfully, this was fixed in the HD remaster, where achieving a high rank will also unlock any of the lower rewards.
* FemaleAngelMaleDemon: The statues of good and evil.
* GiantSpaceFleaFromNowhere: Most of the bosses. At least the Stinger was explained away in a file that says the researchers on the train were studying it, prior to the whole "attack of the killer leeches" thing. It was probably being transported on the train and got broken free during the whole mess.
* GrapplingHookPistol: Reasonably subverted. The hookshot is quite large (taking two blocks of inventory space to have, similarly to large guns), it can only hold 80kg without getting damaged, and is slow.
* TheGreatestStoryNeverTold: The only witnesses to the events of ''Resident Evil 0'' besides Rebecca are [[spoiler:the [[DeathFakedForYou officially dead]]]] Billy, Wesker, and, to a lesser extent, Birkin, who was watching the Training Facility's security feed for at least part of the game. There's no indication that Rebecca told Chris Redfield or Jill Valentine what happened.
* HandCannon: The magnums, as usual.
* HeroOfAnotherStory: Inverted when you think about it. As pointed out by Tom Wilde's plot analysis, Billy and Rebecca sort of just happened to wander into TheLastDance between Birkin and Wesker and [[spoiler: Dr. Marcus]] and don't actually contribute anything until the very end. In any other context, William Birkin would be the protagonist [[VillainProtagonist (albeit an evil one)]] for [[spoiler: blowing up the facility]].
* {{Handguns}}: As usual, the staple weapon, though the ones Billy and Rebecca start out with are subtly different. Billy's is slightly more powerful and will randomly headshot zombies, and either gun can be upgraded later on for more power and faster firing.
* HiddenDepths: Gruff, short-spoken Billy [[spoiler:is remarkably talented at playing the piano.]]
* HugeGuyTinyGirl: One way of emphasizing Billy and Rebecca's "unlikely partner" status.
* IGaveMyWord: Invoked by Billy when saving Rebecca.
* InformingTheFourthWall: Some items have very specific uses. For example, early on there's a room you can get trapped in because there's something stuck in the keyhole, and the character mentions they need something sharp to poke it out. The knife doesn't work, and if it's Rebecca, neither does her mixing kit which is shown to include syringe needles. The only way to open the door is to find an ice pick and give it to the character.
* InsurmountableWaistHeightFence:
** Billy, a former Marine who just survived going through a water treatment facility's river with a zombie toad, cannot swim across a 3-meter gap of water to get a valve handle.
** At one point Billy and Rebecca have to get into the kitchen which is locked behind a special door. They never consider hopping over the open counter into the kitchen.
* InventoryManagementPuzzle:
** Pretty much the whole game. Each character can only hold six slots worth of items, and the series-standard item boxes are nowhere to be found. If you don't know what's coming, you'll probably have to trek back and forth to whatever room you've designated your item room to resupply.
** Inventory struggles are taken to the extreme in the Leech Hunter minigame. Billy and Rebecca each have to collect fifty leech charms, for a total of one-hundred. However, they can only fit ten charms in a slot, and when a charm is picked up it can't be dropped or traded between characters. By the end of the ordeal, the player won't be able to mix herbs or even reload their guns, so charms in dangerous areas have to be collected first.
* InvisibleBackupBand: [[spoiler:Dr. Marcus]] inexplicably has instruments playing in the background when he's singing during the opening scene. Later on, he sings with no backup whatsoever.
* IWontSayImGuilty: Billy refuses to confirm or deny whether or not he really did commit the murders he was sentenced for. [[spoiler:He didn't. The flashback concerning this issue reveal that it was his commanding officer who was responsible. When Billy tried to stop it, he was knocked out cold. When the massacre was discovered, the unit pinned the blame on him.]]
* ItCanThink: The leeches show definite signs of this. On a few occasions, they can follow you different rooms. They also try to cut off your escape by removing the cable car's circuitry.
* JumpScare:
** The zombie that comes out of the refrigerator after certain point in the Ecliptic Express.
** Four crows will fly through a window once you grab the Crank Handle in the Umbrella Management Training Facility.
** The first encounter with the Plague Crawlers is this as two of them will drop from the ceiling.
** The Lurkers, which are encountered late in the game. They will pop out of watery areas.
* KillItWithFire: Flame grenades and molotov cocktails are the best weapons to use against leech zombies; not only do they inflict the most damage, they cause them to die ''without'' exploding.
* KnightInSourArmor: Billy.
* LastLousyPoint: In the Leech Hunter minigame, there are absolutely no indicators where any of the charms are located. If a player carefully goes through the whole mansion and ends up with ninety-nine charms, they'll be forced to do another sweep to get number one-hundred.
* LetsSplitUpGang:
** Bravo Team does this when they decide to search for Billy.
** This can be done by the player as part of the partner system. Some puzzles also force you to do this.
* LoadsAndLoadsOfLoading: Permissible on the [=GameCube=] version, because of the time of release and the high end graphics. On the Wii, however, this becomes frustrating very quickly.
* LostForever: Any item the player doesn't interact with in the Ecliptic Express before it crashes will not be transferred over to the Management Training Facility. Likewise, the wardrobe closet will become inaccessible after the crash, meaning that Rebecca and Billy will be stuck with whatever outfit the player picked for them. Although the ''HD Remaster'' adds a suitcase to your inventory as a new personal item, from which you can change your costumes at any time.
* MadeOfIron: Billy, when compared to Rebecca.
* MalevolentMugshot: The large portrait of Dr. Marcus in the entrance to the training facility is weird but not unheard of in a school. What's really silly are the doors with his profile on them that can only be opened with leech shaped keys.
* {{Minigame}}: Leech Hunter.
* NeverSplitTheParty: For the most part, the game's easier if you keep Billy and Rebecca together, since it lets you put out twice as much firepower quickly. However, there's parts where you have to split them up, and others where it's easier to sneak by monsters if there's only one of you around. Particularly anything with leech zombies.
* NinjaPirateZombieRobot: Eliminators, which are ''zombie monkeys''.
* NintendoHard: This game is comparable to ''[[VideoGame/ResidentEvilCodeVeronica Code: Veronica]]'' as the overall lack of ammo and healing items (that you have to split between two characters) is among the stingiest in the entire series. Unlike that game, however, you do not have a decent knife to help conserve ammo, so you must make every shot count, avoid enemies when possible and only heal when absolutely necessary. If you don't have an excess of ammo for your best weapons and healing items for a boss battle... [[UnwinnableByDesign forget it]]. Have fun starting the entire game over!
* OddCouple: An innocent, delicate-looking, 18-year-old rookie of an elite police force teams up with the escaped convict she is supposed to be arresting, a gruff, cynical, rather intimidating-looking 26-year-old ex-Marine who was sentenced to death for murdering 23 people. Their relationship starts as TeethClenchedTeamwork, but they eventually become FireForgedFriends after he saves her life repeatedly, proves to be a decent guy, and she [[spoiler:lies to her team to protect him.]]
* PapaWolf: See OddCouple above; Billy becomes a "big brother" version of this to Rebecca over the course of the game.
* PlotHole: Rebecca is bitten, scratched and even swarmed by leeches, but she never contracts the t-Virus. This is not even a case of GameplayAndStorySegregation, it happens during several cutscenes. To make matters worse, there is a file in the game implying that by simply touching a leech will get you infected immediately after.
* {{Prequel}}
* PsychoStrings: The leech zombie theme.
* PuzzleReset: Thankfully, all the puzzles in the game. The most notable is the one near the end of the game. It requires you to push wooden crates to one side of a pit and fill it with water. Two catches: One, there's a metal one in there too that needs to be dealt with. Two, there's also a grate that impedes how you move the crates.
* RefrigeratorAmbush: A zombie pops out of the refrigerator in the dining car after you've solved a few puzzles.
* RoaringRampageOfRevenge: The "mysterious youth"/[[spoiler: Dr. Marcus]], as he is sure to announce in every single line of dialogue. His rampage sets in motions the events of the rest of the series.
* ScareChord / PsychoStrings: Whenever a leech zombie shows up.
* ScaryScorpions: The first boss, the Stinger, is a scorpion the size of a pickup truck.
* ScrewTheRulesImDoingWhatsRight: [[spoiler:Rebecca refuses to arrest Billy, and by the time she manages to reunite with Enrico, she abandons her mission completely to save him. By the end of the game, she's faking his death.]]
* SelectiveMemory:
** Inverted. At one point, the player has [[LetsSplitUpGang to split Rebecca and Billy up.]] The one who goes upstairs (by using the hookshot) will find a file that hints at the combination to a locked room. It is explained how the other character gets the dial (which is inexplicably off) to enter the combination, ''but not how they know about the file, let alone the password''. And that knowledge is needed for the other character to progress.
** Just before, Billy has to save Rebecca from falling into a chasm. In order to unlock the door, Rebecca needs to pick up a note that says what the power settings need to be. But, when she falls into the chasm, Billy needs that note, because it hints that [[spoiler: he's got to go through the boiler room.]] So he really shouldn't know that. Both of these instances, though, are because the characters are being controlled by the player.
** They both have working walky-talkies at the beginning of the game. Even though we don't see cutscenes for every time they coordinate a puzzle, presumably this is how they are able to solve the combination puzzle, or any of the other puzzles.
* SemperFi: Billy, who is a badass former Marine.
* ShotgunsAreJustBetter: You get two in this game: a Hunting Gun, an over-under shotgun that only holds two shells but is slightly more powerful (and actually fired correctly, from the shoulder), and the usual pump-action shotgun, which holds more shells but is slightly less powerful.
* ShoutOut: [[ShoutOut/ResidentEvil0 Shout Out Page.]]
* SkippableBoss: You can just run away from the first encounter with the Leech Man, instead of fighting it. This will skip straight to the cutscene where Billy comes in to help Rebecca, and save you a good 15-16 rounds of pistol ammo.
* SolveTheSoupCans: The train's E-brake system. There's [[VoodooShark no possible rationale]] for the puzzle that doesn't make it even crazier.
* StockVideoGamePuzzle
* SuspiciousVideoGameGenerosity: Right before the final boss, you find some ammo and healing items.
* TakeYourTime:
** The player can take as long as they like on the speeding train until the sudden urgent need to slam on the brakes appears.
** Getting to Billy, after he's nearly drowned is also a moment to take your time.
** Averted at one point when Billy must save Rebecca from falling into a chasm. If he dawdles for too long, Rebecca dies. This requires a good portion of time and not realizing [[spoiler:that you need to go through the boiler room.]]
* TheMedic: Rebecca, as the field medic of S.T.A.R.S is the only one who can combine herbs to make stronger medicine.
* TheWormThatWalks: The leech zombies and [[spoiler:Dr. Marcus himself.]]
* ThoseTwoBadGuys: [[MagnificentBastard Wesker]] and [[MadScientist Birkin]], who show up at several points in cutscenes watching the events on the security cameras and attempting to contain the situation.
* TimedMission:
** Stopping the Ecliptic Express before it crashes.
** Saving Rebecca from Centurion.
** Saving Rebecca before she falls, although most players won't realize it unless they wait around long enough.
** The final boss fight.
* TwoKeyedLock: More than a few of these around to take advantage of the partner system, [[spoiler: including the exit.]]
* VillainousFriendship: Notes lying around the facility and cutscenes highlight a rare sincere (for Umbrella employees) friendship between Birkin and Wesker.
* WhatHappenedToTheMouse: Billy hasn't been heard from in the series since, and neither has Rebecca after the events of the original game. Canonically, Rebecca is supposed to have survived the events of the original game.
* WickedCultured: [[spoiler:Dr. Marcus. HumanoidAbomination, talented opera singer?]]
* ZombieApocalypse: The earliest point in the Raccoon City zombie apocalypse timeline.
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