[[quoteright:275:http://static.tvtropes.org/pmwiki/pub/images/Invaders.jpg]]
->''"[[TitleDrop The Invaders]] - alien beings from a dying planet. Their destination, the Earth. Their purpose: to make it THEIR world. David Vincent has seen them. For him, it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed, deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the invaders are here; that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun."''\\
--The OpeningNarration

'''The Invaders''' is an American ScienceFiction TV show.

(Not to be confused with Creator/MarvelComics' UsefulNotes/WorldWarII superhero comic book ''ComicBook/TheInvaders'', or any other series involving alien invaders.)

The show was produced by Quinn Martin Productions (who made several other famous TV series of the time) for the Creator/{{ABC}} television network in January 1967. The series follows the life of an architect named David Vincent (Roy Thinnes) who, by sheer chance, happened to witness the landing of an UFO after getting lost while driving one night. Discovering that aliens disguised as humans have infiltrated Earth and are planning to take over the world, Vincent sets out to thwart their plans and to find evidence of the invasion so he can warn the rest of humanity.

Apparently, the aliens -whose true form was never revealed- were an emotionless race from a dying world that had decided to take over the Earth to survive. Having physically altered themselves, they could easily pass for humans (though there were small signs that could be used to spot them, for example some of them could not bend their little fingers.) They also arranged it so that their bodies disintegrated if they died, leaving no evidence behind; in fact they were fanatically willing to kill anybody, including themselves, in order to hide their presence on Earth.

[[OnceAnEpisode Every episode]], Vincent would investigate and discover an operation run by the unnamed invaders, which [[EasilyThwartedAlienInvasion he managed to ruin]], usually by forcing them to destroy it themselves to avoid discovery. However he failed to convince most people of the truth and was often accosted by the law as a troublemaker. Later on the series he did manage to start the Believers, a small, secret underground [[LaResistance resistance]] who aided him.

While the idea of [[VoluntaryShapeshifting disguised invaders]] was already an old one (the ''Encyclopedia of Science Fiction'' website suggests that the series was made too late to be successful), ''The Invaders'' may have been the first American show to present the matter seriously, as opposed to the more goofy previous SF movies and TV shows. Good writing and serious acting made it effective ParanoiaFuel and the show holds up well even today.

The series ran only for two seasons (one-and-a-half, really, as it began midseason) and had no definitive ending. In 1995, a sequel TV movie was made (apparently as a failed pilot for a new series) in which an ex-con (played by ''Series/QuantumLeap'''s Scott Bakula) is convinced by the now-elderly Vincent (still played by Roy Thinnes!) to pick up the cause against the aliens.

The series was also adapted as [[ComicBookAdaptation comic books]] and novels.
----
!!Tropes:

* AlienInvasion: Duh. Type II, infiltration.
* AlwaysChaoticEvil: Subverted: The aliens did not hate humanity, but didn't care about us because they lacked emotions. Further subverted in that a few "mutant" members of their species ''did'' have emotions and were more sympathetic.
* FlyingSaucer: The alien spaceships were based on the 'Venusian Scoutcraft' allegedly witnessed by [=UFOlogist=] George Adamski.
* FollowTheLeader: ''The Invaders'' has been accused of being a ScienceFiction variation of an earlier Quinn Martin series, ''Series/TheFugitive''.
* IAmSpartacus: Used in one episode when an alien asks a group of people which one is Vincent.
* LegacyCharacter: In the {{sequel}}, the torch is passed by Vincent to a new {{Everyman}} hero.
* {{Meme}}: "David Vincent has seen them" is part of the OpeningNarration.
* MidseasonReplacement
* NoBodyLeftBehind
* PlayingAgainstType: A rare non-cop show from QM Productions.
* ThemeTune: The show's theme, composed by Dominic Frontiere[[note]]and originally intended for ''The Unknown'', a SpinOff of ''Series/TheOuterLimits'' that never went beyond the unsold pilot stage[[/note]], became famous and is still eerily effective.
* TheyLookLikeUsNow: All the aliens.
* UnflinchingFaithInTheBrakes: In the first episode, a little old lady with suspiciously stiff little fingers does this in front Vincent's business partner who is arriving in town to find him.
* TheUnreveal: We never see the aliens' true form, or even find out what they or their world are called.
* WrongTurnAtAlbuquerque: It all started that way...
* ZanyScheme: Some of the aliens' plans were rather... ''unusual'', such as using carnivorous insects to destroy humanity.
----