!!Jason Nesmith/Commander Peter Quincy Taggart
->Played By: Creator/TimAllen
->Voiced By: Creator/SalvadorDelgado (Latin American Spanish dub), Creator/HirotakaSuzuoki (Japanese dub)

An actor who once starred as the captain in a sci-fi show named ''Film/GalaxyQuest''. He's arrogant, seemingly a jerk to his costars, and is stuck in the past, clinging to the old glory days of the show, enabled by the devoted fans who love his showboating antics. At the beginning of the movie, at yet another convention, Nesmith is confronted with how pathetic he has become and drinks himself into a stupor. It's in this state that he encounters the aliens and unwittingly agrees to his first real mission.
* EightiesHair: Back on the show.
* BreakTheHaughty: At the start of the film, he realizes how pathetic he's become.
* TheCaptain: His position in the show, which means he gets giddy when he gets to be an ''actual'' captain.
* CaptainErsatz: on the ShowWithinAShow, of Captain James T. Kirk by way of Tim Allen.
* CatchPhrase: "Never give up! ''Never'' surrender!"
* TheCharmer: With his fans, yes. With his fellow actors... not so much.
* GuileHero: He's got a good head for tactics and bluff and has an actor's talent for reading people.
* HeroicBSOD:
** Suffers an in-universe CreatorBreakdown at the beginning of the film after hearing gossip about the negative impact of the show has done to him and his cast-mates.
** He also has a more guilt-ridden one after [[spoiler:he tells Mathesar the truth about the show not being real.]]
* HiddenDepths: He is a bit arrogant at first, but he eventually shows a nicer side.
* TheKirk: His role in the show.
* JumpedAtTheCall: Once the interstellar shakes wear off, he's thrilled that a bunch of real, actual aliens built a replica of the ship and consider the cast to be actual heroes.
* LargeHam: Much to the annoyance of his fellow actors.
-->'''Jason:''' [[IncomingHam Your commander is on deck!!]]
* TheLeader: His position on the show, and he eventually takes the position for ''real''.
* NoCelebritiesWereHarmed: To William Shatner. He's the show's main cast member who has an inflated ego and is shocked to discover how the rest of the cast dislikes him for it.
* StepfordSmiler: Behind the egotistically jovial facade lies a sad ManChild escapist who desperately seeks to find the worthwhileness of his famed television role and found it thanks to the Thermians.
* TookALevelInKindness: Contrast his appearances at the beginning and at the end of the film; at the beginning he was a NiceCharacterMeanActor who was unashamedly hogging the spotlight and gets disappointed when he doesn't get the fanfare he wants. At the end, he realizes that the crowd at the convention aren't paying his costars any attention, and gestures for them all to come up and share the spotlight as they deserve it.
* UnfazedEveryman: At first, when first found himself on an actual spaceship and faces Sarris for the first time, he at first thinks it's all part of the fandom show despite the interior decor being likely impossible to be constructed by a group of fans, but when he's transferred back to earth via teleporter, he is... [[HeroicBSOD considerably]] fazed.
* UnnecessaryCombatRoll: He does this on the away mission before any actual danger occurs, out of habit from doing it on the show. It doesn't actually help him at first, and even causes him to lose his weapon. [[spoiler:It helps him kill Sarris in the end.]]
-->'''Gwen:''' [[SarcasmMode Does the rolling help]]?\\
'''Jason:''' Uh huh. It helps.\\
'''Gwen:''' ''[smirking]'' Where's your gun?\\
'''Jason:''' ...Shit!\\
'''Alexander:''' [[SarcasmMode "It helps."]]
* MyGodWhatHaveIDone: [[spoiler: After he tells Mathesar the truth about the show not being real.]]


!!Gwen [=DeMarco=]/Lt. Tawny Madison
->Played By: Creator/SigourneyWeaver
->Voiced By: Yolanda Vidal (Latin American Spanish dub), Creator/MamiKoyama (Japanese dub)

Another star of the show ''Film/GalaxyQuest'' now trapped on the convention circuit. Gwen played the show's fanservice character and is resigned to the idea that she never gets taken seriously. On the show, she had superfluous job of repeating the computer's statements and repeating the orders of the captain to the computer, so when the aliens build a real version of the ship, she gets stuck with that job again. There's some indication that Gwen and Jason were once genuinely attracted to each other but it died quickly once Gwen figured out what kind of guy Jason really was.
* ActionGirl: Though not in the old show, much to her chagrin.
* BridgeBunny: Her original role was to stand on the bridge, [[MaleGaze lean toward the camera,]] and "repeat everything the computer says". An enforced trope, because the computer ''only'' responds to her questions!
* CaptainErsatz: A disgruntled version of Uhura.
* CommunicationsOfficer: She does this during the movie out of principle--it's her one job, and she will do it even though it's stupid.
* HeartIsAnAwesomePower: While not discussed in the movie, one advantage to having the computer respond to only one officer is that it serves as a security precaution (in case, say, an invading force takes over the ship, as eventually happens with Sarris) and in some respects she is actually the most indispensable member of the crew, though admittedly it's probably rather dumb to have ''only'' one officer have this responsibility.
* TheLancer: Alexander is the lancer on the show, but in ''real life'' Gwen fills the role.
* ImpossiblyLowNeckline: She '''''HATES''''' it!
* LimitedAdvancementOpportunities: She just repeats what the computer says, and she '''''HATES''''' that too!
* MostCommonSuperpower: The essay on her character is "About ''my boobs'', and how they fit into ''my suit!''".
* NoCelebritiesWereHarmed: To Nichelle Nichols in her role as a bridge officer, and Jeri Ryan in being a skilled actress trapped as a shameless MsFanservice character (and unlike Ryan, never being able to break out of that role).
* SarcasticDevotee: To Nesmith.
* ShowSomeLeg: in a deleted scene, she invites two aliens to have sex, even showing them her boobs before instructing the computer to liquify them with a blast door.


!!Sir Alexander Dane/Dr. Lazarus of Tev'Meck
->Played By: Creator/AlanRickman
->Voiced By: Armando Réndiz (Latin American Spanish dub), Creator/UnshoIshizuka (Japanese dub)

Lazarus is a "Mak'tar", a member of an alien species renowned for their intellect. He is deeply intelligent and has psionic abilities. Additionally, he has a non-standard weapon and a pretentious catchphrase: "By Grabthar's hammer, by the sons of Warvan, you shall be avenged!". A trained Shakespearean British actor, Alexander resents both his catchphrase and being typecast.
* AlwaysSecondBest: To Jason.
* AuthorAvatar: Alexander's Shakespearean background and resentment of being typecast following his BreakoutRole is likely a {{Flanderization}} of his actor's real-life Shakespearean background and his resentment of being typecast as a villain following his BreakoutRole in ''Film/DieHard''.
* CaptainErsatz: Not just of Spock, but of the late Leonard Nimoy, who despised being pigeonholed as well.
* {{Catchphrase}}:
** "By Grabthar's hammer, by the sons of Warvan, you shall be avenged!" Ironically enough he hates it.
** Also serves as an IronicEcho, a TearJerker and a PreAsskickingOneLiner [[spoiler:(when he speaks the line to comfort a dying Quellek, who considered him a father figure)]].
---> '''Alexander:''' ''[gentle, but with gravitas]'' By Grabthar's hammer... by the sons of Warvan, you ''shall'' be... ''' ''avenged'' '''.
* ClassicallyTrainedExtra: ''Bitter'' about it, too.
* DeadpanSnarker: It helps that he is played by Alan Rickman.
* HeroicBSOD: He goes through a minor one when [[spoiler:Quellek]] is killed.
* HiddenHeartOfGold: When [[spoiler:Quellek is shot]], Alexander delivers his catchphrase with complete sincerity, after having earlier stopped him from reciting it.
** Even earlier, after [[spoiler:Jason tells Mathesar the truth about the show not being real]], he experienced a HeroicBSOD by being guilt-ridden for [[spoiler:Jason's explanation]] along with the rest of of his cast-mates.
* INeedAFreakingDrink: When asked where he's going after the traumatic first contact with Sarris, he shouts back "to see if there's a pub."
* ItsPersonal: Once [[spoiler:Quellek]] is killed, Alexander charges at Sarris' mooks and assaults them.
* JerkassFacade: He comes across as rather annoyed and cynical by everything, but at the end of the day he's a good guy.
* NoCelebritiesWereHarmed: Part Creator/LeonardNimoy (bitter about being [[IAmNotSpock typecast as Lazarus]] - Nimoy got over it, though), part Creator/PatrickStewart and part Alec Guinness - a respected Shakespearean actor who ended up on a cult science fiction show, and is none too happy about it (Stewart doesn't regret his time on ''Franchise/StarTrek'' and in fact, is proud of his role, but Guinness was upset that many people only remembered him from ''Franchise/StarWars'').
* NotSoAboveItAll: World-weary, snarky, and British... but he still holds his scanner upside-down on the planet. And only realizes after boldly starting them in the wrong direction.
-->'''Tommy:''' You know with all that makeup I almost thought you were smart for a second!\\
'''Alexander:''' Shut ''up''!
* PhraseCatcher: Fans constantly repeat his character's catch phrase at him and he ''despises it''.
* RoaringRampageOfRevenge: After [[spoiler:Quellek is shot]], he opens up a ''huge'' can of whupass on Sarris' {{Mooks}}.
* RubberForeheadAlien: Subverted; the forehead really is just rubber, and become visibly damaged near the end so his real hair starts poking through.
* ScreamingWarrior: He charges at Sarris' men screaming when [[spoiler:Quellek]] is killed.
* TheSpock: The character on whom he's based.
* SurroundedByIdiots: He never actually says this, but it's all over his face and in his voice.
* TookALevelInBadass: He charges an alien head-on while unarmed and ''wins''.
* WhatHaveIBecome: PlayedForLaughs.
-->'''Alexander:''' How did I come to this? I played Richard III. There were five curtain calls. I was an actor once, dammit; now look at me, LOOK AT ME! I won't go out there, and I won't say that ''stupid'' line one more time. I can't! I won't!


!!Tommy Webber/Lt. Laredo
->Played By: Daryl Mitchell
->Voiced By: Creator/BenjaminRivera (Latin American Spanish dub), Koji Ochiai (Japanese dub)

Tommy parodies an actor in the "boy wonder" role, who has aged considerably since he was on the show. His role as Laredo is essentially that of the pilot, but when he flies the real ''Protector'' out, it takes him most of the film (and carefully studying his old ''Galaxy Quest'' episodes) to remember how to do it right.
* AcePilot: In the show; not so much in real life. [[spoiler:After he reviews his technique he's good enough that he can attract the mines to drag without actually getting hit.]]
* CaptainErsatz: Of Wesley Crusher from ''Series/StarTrekTheNextGeneration''. Creator/WilWheaton (the actor who played Wesley) commented that the one aspect of ''Trek'' fandom the film lacked was a fan complaining about the presence of a kid on the bridge. (In fact, Wheaton would have liked to [[TheCameo play the role himself]].)
* DoingItForTheArt: This occurs in-universe as, due to the fact that he was a kid at the time, he naturally took his role on the show quite seriously, to the point of coming up with his own consistent method of how the ship's controls worked. This comes in handy when the Thermians recreate the ship from the episodes.
* KidAppealCharacter: On the original show, he was about ten years old.
* ScreamsLikeALittleGirl: And hilariously so.
* TeenGenius: His character.
* TookALevelInBadass: "Pedal to the metal!"


!!Fred Kwan/Tech Sgt. Chen
->Played By: Tony Shaloub
->Voiced By: Paco Mauri (Latin American Spanish dub), Koichi Makishima (Japanese dub)

Chen is in charge of the engine room and the operator of the "digital conveyor" (a version of the ''Franchise/StarTrek'' transporter). He acts in a detached manner and is completely unfazed by the strange and often disturbing events that occur.
* BunnyEarsLawyer: He may be a little nuts or detached but he's good at what he does... eventually.
* CaptainErsatz: Of Scotty
** An inversion, however. Like Scotty, he turns out surprisingly skilled, but unlike Scotty deadpans it completely... except at the teleporter, the only thing Scotty never broke a sweat on.
* {{Cloudcuckoolander}}: His spacey attitude (no pun intended). A cut scene indicated the [[TheStoner reason behind this]].
%%* GreaseMonkey
* FakeNationality: "Kwan's not even my real name!" In-universe, he's an actor who plays a guy who changed his name then played a guy who is fake. In the process, the real actor played a guy who played a guy and must become that guy even though he's fictional.
* HeroicBSOD: He freaks out when he's asked to operate the "digital conveyor," which could kill Jason if he does it wrong.
** He also has a guilt-ridden one after [[spoiler:Jason tells Mathesar the truth about the show not being real.]]
* InterspeciesRomance: He eventually falls in love with a Thermian.
* LovableNerd: In reality, he's only a ''Hollywood'' nerd.
%%* MacGyvering
%%* MrFixit
* NoCelebritiesWereHarmed: To James Doohan, playing the engineer with an obvious case of FakeNationality (here made even more obvious by his playing a different ''race'').
* ObfuscatingStupidity: Or maybe not; frankly, it's hard to tell.
* TheStoner: It's cut out for the most part, but he is explicitly asked whether he's high at one point, he's constantly munching on snacks, and he's ''way'' too relaxed.
* UnfazedEveryman: He genuinely doesn't seem that freaked out by the events around him... aside from his doubts about successfully operating the digitizer.


!!Guy/Crewman #6
->Played By: Creator/SamRockwell
->Voiced By: Herman López (Latin American Spanish dub), Kazuhiro Yamaji (Japanese dub)

An actor who played an extra in one episode of ''Film/GalaxyQuest''. He suffers from paranoia that he will end up in a {{Red Shirt}}'s [[HesDeadJim natural state]] during the film. The character is based on real-life ''Franchise/StarTrek'' actor Guy Vardaman, who played an uncredited background character.
* {{Adorkable}}: Nearly two decades after his cameo on the show, he's still nothing but proud of it and perfectly satisfied with this tiny blip of a career.
* AscendedExtra: InUniverse. From no name redshirt [[spoiler: to chief of security]] in-show, of course.
* ButtMonkey: But not nearly to the extent he thinks he is. He's more of a strange, whiny nuisance to the others.
* CowardlyLion: Spends most of the movie whimpering in a corner about the gory death he thinks is inevitably coming for him, but is prepared to go on a suicidal charge into the enemy lair, reasoning that if he's going to die he might as well die in a blaze of glory. [[spoiler: Luckily for him, he's not destined to die because he's mistaken about his role as a RedShirt.]]
* GenreSavvy: He knows full well that {{Red Shirt}}s like the character that he played in the ''Galaxy Quest'' show-within-a-film tend to die to prove the seriousness of the situation, and is terrified that the same fate will befall him now that they're in a situation that mirrors the show's conventions.
-->Didn't you guys ever ''watch'' the show?
* HisNameReallyIsBarkeep: He is even more freaked out than the rest of the cast that they have just been transported aboard an alien ship and as he is the only one the Thermians do not recognise, he just introduces himself as "Guy", making the audience think for the whole movie that he was too shocked to even remember his own name and in-keeping with the fact that he is supposedly just a disposable RedShirt. However, the credits for the in-universe reboot of the shot reveal that his name really ''is'' Guy; his full name is [[spoiler: Guy Fleegman.]]
* {{Irony}}: Guy keeps freaking out that he's gonna get killed throughout the entire movie. [[spoiler: When Sarris manages to kill off the crew in the surprise attack, he's the only one shown not being shot.]]
* MeaningfulName: His name is Guy, in keeping with him being just a random extra nobody really knows. In fact, it's not until the end of the movie that we learn "Guy" actually is his name at all, rather than just everyone calling him "guy" because they don't know his real name (he introduces himself as Guy, but at the time he was having a FreakOut so it seems like he was just panicking).
* MonsterMunch: A parody of it; his in-show character was "eaten by a lava monster before the first commercial"; he's terrified that he's going to buy it too.
* OnlyOneName: For most of the movie, which he uses as prime evidence of his unlikelihood to survive.
-->'''Gwen:''' Guy, you ''have'' a last name.\\
'''Guy:''' ''Do I?'' ''DO I?!''
** The credits at the end list it as [[spoiler:Fleegman]].
* PluckyComicRelief: Fred tries to comfort Guy in the third act by suggesting maybe he's this - in fact, Fred becomes the TropeNamer as a result. [[spoiler: Realizing that he's this and not a RedShirt is a great relief to him.]]
* RedShirt: On the show, he got killed by a lava monster shortly into the episode. [[spoiler: However, he's never killed off!]]
-->(When the whole cast are in equal danger) '''Gwen:''' Let's get out of here before one of those things kills Guy.
* WrongGenreSavvy: Rare example of it working in the character's favor. He's terrified of getting killed because he thinks he's the RedShirt. Fortunately for him it turns out he's actually the PluckyComicRelief.

->Played By: Creator/RobinSachs
->Voiced By: Ricardo Brust (Latin American Spanish dub), Atsuki Tani (Japanese dub)

A genocidal alien warlord, Sarris is the force that ultimately causes the Thermians to seek the Galaxy Quest team out for help. When he turns up, things get a lot worse.
* AxCrazy: The guy is slightly nuts.
* BadBoss: The man decapitated his previous [[TheDragon lieutenant]] for failing to raise the shields in time. He then leaves several loyal soldiers to die on the Thermian ship.
* BigBad: The one behind the whole storyline kicking off.
* [[spoiler: CharacterDeath: He dies when Jason shoots him and he is disintegrated.]]
* ColdBloodedTorture: He did this to the Thermian commander who preceded Mathesar.
* DeadpanSnarker: Emphasis on the deadpan. If he makes a joke at all, it's usually more terrifying than funny.
* EvilBrit: Played by Robin Sachs.
* EvilIsHammy: He generally gets a bit loud, though it's often terrifying instead of funny. When he stops being hammy, he's ''really'' serious.
* EyepatchOfPower: Gains one after the first attempt to deal with him fails.
* ForTheEvulz: He already had the information he needed and explicitly invokes this trope.
-->'''Thermian captain:''' I have told you all I know... if you have any mercy within you, please, let me die.
-->'''Sarris:''' When I grow weary of the noises you make, you shall die!
* GallowsHumor: Leading to possibly his only funny moment in the entire film.
--> '''Jason''': Hey Sarris, how're you doing?\\
'''Sarris''': ''[shows the head of his lieutenant mounted on a stick]'' Better than my lieutenant!
* HandicappedBadass: He's horribly cruel and very depraved, but the guy is a good straight-up fighter in spite of lacking one eye and having a prosthetic hand. [[spoiler: And this is just a day or two ''after'' he was crippled when Nesmith ordered the Thermians to bombard his ship]]
* KickTheDog: Oh, where to begin.
** He tortured the Thermian's commander to death [[ForTheEvulz to hear him scream]].
** He presented the Thermians promises of mercy only to continue his genocide.
** Watch as the ''Protector II'' leaves the space port. You can see Thermia utter devastated, with only a wedge of the entire planet left. Sarris is the likely culprit.
** He forces Jason to reveal to the Thermians that everything they believed in was a lie.
** Even when he has nothing to gain from, he decides to self-destruct the Protector and have the air sucked out of the crew chambers the Thermians occupy.
* KnightOfCerebus: After it turns out that he's actually a real threat and not something from a B-movie, the humor rating drops significantly whenever he's onscreen, and one of the only two jokes involving him is a bit of GallowsHumor where he reveals he decapitated his lieutenant.
* PreAssKickingOneLiner: Delivers one before opening fire on the Protector in a response to Nesmith insulting him when he thought he couldn't hear.
-->'''Sarris:''' Perhaps I'm not as stupid as I am ugly, commander.
* RedRightHand: He has an eyepatch and a prosphetic hand after the first attempt to fight him fails.
* ThisCannotBe: He yells "Impossible!" when [[spoiler:the core detonation sequence on the Protector is stopped]].
* VileVillainSaccharineShow: The film is a lighthearted ActorRoleConfusion comedy with endearingly innocent aliens and the cast of a Star Trek {{Expy}}... and he is a sadistic, genocidal maniac, not above murdering underlings who fail him, who takes a specific glee in forcing Jason to BreakTheCutie by explaining the nature of their "historical documents" to a culture that has no concept of fiction.

->Played By: Enrico Colantoni
->Voiced By: Javier Rivero (Latin American Spanish dub), Eiji Ito (Japanese dub)

The leader of the Thermians, though he steps back to let Jason lead. He and his other people are completely ignorant of any type of falsehood, including fictionalized entertainment, and thus they have no idea that ''Galaxy Quest'' was just a TV show.
* ActuallyPrettyFunny: Seen laughing with the rest of the Thermian crewmembers over [[spoiler: how the "Historical Documents" they based their entire culture on is nothing but fiction.]]
-->''"Their ship was a model, as big as this!"'' (holds up his thumb and forefinger an inch apart) ''"A very clever deception indeed! [[AnnoyingLaugh Ah Lah ah lah ah lah!]]"''
* BreakTheCutie: When Jason finally tells him the truth, Mathesar is broken almost beyond the point of speech.
* CaneFu: [[spoiler:Mathsar uses his cane to beat down Sarris after getting tortured.]]
* HeroicBSOD: See BreakTheCutie above.
* MrExposition: By virtue of AsYouKnow -- Mathesar is eager to show the crew how perfectly they've replicated the ''Protector'', thus explaining the ship's functions to the audience as well.
* StarfishAliens: Without his [[AFormYouAreComfortableWith holographic disguise,]] he looks vaguely like conjoined twin octopi.
* StrangeSyntaxSpeaker[=/=]WhatTheHellIsThatAccent: Thermians speak a language ''[[StarfishLanguage very]]'' [[StarfishLanguage different from English.]] They use translators to get around this, but their speech still comes out very stilted and strange, somewhere between these two tropes.
* YouAreBetterThanYouThinkYouAre: When he wishes that the actors would stay because the Thermians have no commander, Nesmith looks at him and says they have a ''great'' commander.
* YouAreInCommandNow: When the actors leave at last, Jason appoints Mathesar Commander of the ''Protector''.