A series of humorous {{Game Mod}}s for ''VideoGame/{{Doom}}'' by Cyb, beginning with [[http://www.doomworld.com/idgames/index.php?id=11738 The Adventures of MassMouth]] (2000), followed by [[http://www.doomworld.com/idgames/index.php?id=12090 MassMouth 2]] (2003). A prequel, [[http://www.doomworld.com/idgames/index.php?id=13055 Massmouthmas]], was released in 2004.

The series features Massmouth, a green, one-eyed alien in the employ of an intergalactic magnate, The Worm, who [[CollectorOfTheStrange loves collecting unique and valuable artifacts]]. Massmouth is one of [[ArtifactCollectionAgency the men tasked with retrieving stuff for The Worm]] from a variety of planets, and such quests are what the original ''The Adventures of [=MassMouth=]'' consists of.

''[=MassMouth=] 2'', boasting a more complex storyline, sees The Worm's base attacked by mysterious invaders and The Worm kidnapped, prompting Massmouth to head out to rescue his boss. ''Massmouthmas'' is a "Christmas special" puzzle level.

Note that Massmouth was [[http://planetquake.gamespy.com/View.php?view=ModeloftheWeek.Detail&id=28 originally a skin]] for ''VideoGame/QuakeII'' by Stephen Monteith.

The mods are designed for the game port [[http://zdoom.org ZDoom]]. (Unfortunately, the latest versions of [=ZDoom=] appear to have some compatibility problems which may make certain parts unpassable without cheats.)
!!Tropes featured in the entire series:
* CamelCase: Variable--the author sometimes spells the protagonist's name as "[=MassMouth=]", and sometimes simply as "Massmouth".
* {{Cyclops}}: Massmouth. He also appears as a bot in ''Skulltag'' (a ''Doom'' source port focused on multiplayer) where one of his lines is a complaint about his lack of peripheral vision.
** The Worm (whose appearance is taken from ''VideoGame/HalfLife: Opposing Force'''s Pit Worm.)
* IdiotHero: Massmouth doesn't seem to be very bright. Especially visible in ''Massmouth 2'', where his lines are basically mostly "what?" or "uh?"
* NintendoHard: ''[=MassMouth=] 2'', as well as the later parts of ''The Adventures of [=MassMouth=].'' ''Oooh boy.'' The enemies aren't numerous, but they have a lot of health, hit really hard, all while ammo is very scarce.
* ReferenceOverdosed: There are a lot of direct quotes and shout-outs (for example, the Worm's employees have names like [[VideoGame/HalfLife Freeman]] and [[Series/StarTrekTheOriginalSeries Spock]]). Furthermore, many of the enemies and characters include real-life persons or are taken straight out of other games, such as ''VideoGame/HalfLife'', though they're given different names.
* SpeciesSurname: The Worm, though it might be just a nickname.

!!Tropes in ''The Adventures of Massmouth'':
* AbandonedMine: Found on the planet Nero, and populated with dangerous Stuka-Bats (which are the very reason the mines were abandoned).
* ArtifactCollectionAgency: The Worm essentially has his own ArtifactCollectionAgency meant to fill out his, well, private collection of artifacts.
* BatOutOfHell: The Stuka-Bats, which inhabit the dark mines of Nero.
* CollectorOfTheStrange: The Worm.
* TheFullNameAdventures
* InfiniteFlashlight: The Zippo Lighter, used to light up the dark areas in the mine level. It's actually a replacement for the chainsaw, that makes clever use of ''Doom'''s built-in MuzzleFlashlight code.
* LostSuperweapon: The "Eye of Mahan", created by a wizard for an ancient king, supposed to "take out entire legions of men". {{Subverted}}--for all its fame, it simply doesn't work at all, and probably never did.

!!Tropes in ''Massmouth 2'':
* BigBad: [[spoiler:John Romero]].
* EvilAllAlong: The [[spoiler:Qbot, who initially offers to guide Massmouth to a getaway vehicle,]] but attempts to lead him to his death multiple times, as he's secretly working for the BigBad.
* GotTheWholeWorldInMyHand: One of the ending splash screens, for the ending where you [[spoiler:kill both the Worm and Romero and take over their empires]], shows [[spoiler:Massmouth grabbing the entire galaxy.]]
* IAlwaysWantedToSayThat: [[spoiler:Trooper]], after he quotes ''Film/LordOfTheRings'': "I come back to you now at the turn of the tide."
* [[spoiler:MissingMissionControl]]: [[spoiler:Trooper]] getting killed by the BigBad. He comes back as a SpiritAdvisor, though.
* MultipleEndings: Six of them. In the text file for ''Massmouthmas'', the author tartly notes that making a sequel would be a real pain now.
* OutsideContextProblem: A side-plot involves "[[Music/{{Sepultura}} Rattamahattas]]", a belligerent race that wishes to take over the hero's home planet.
* APlanetNamedZok: Zeeble, Massmouth's home planet.
* PunnyName: Professor Egnogin.
* SpiritAdvisor: [[spoiler:Trooper]]. He even refers to it as "a ''Film/StarWars'' thing".
* UncannyValley: In one of the endings, Massmouth notes that the way the BigBad's head always seems to be facing him is really creepy. [[invoked]]
* UnexplainedRecovery: [[spoiler:Linguica]].
-->'''[=MassMouth=]:''' Doesn't anybody stay dead any more?
* VideoGameTutorial: For some inexplicable reason, [=MassMouth 2=] has an optional tutorial which basically teaches you how to play a first-person shooter.
* WeCanRuleTogether: The BigBad attempts this on Massmouth, twice. The first time, your choice determines the next mission only, since if you agree to work for him then he decides you're too dangerous to keep alive anyway. He tries it again at the end of the game; cue MultipleEndings.
* WidgetSeries: This game is kind of bizarre at times (the village of miniature John Carmacks, anyone?).