History WesternAnimation / ScoobyDooAndTheAlienInvaders

* NewAgeRetroHippie: Crystal the photographer is one. [[spoiler:Or so it seems, until it's revealed that she's an AlienAmongUs.]]

* {{Greed}}: [[spoiler:The primary motivation for the villains. Finding a mother lode of gold made them extremely greedy and they still kept their cushy jobs at the SALF station. In the climax they seize any opportunity to try to get even richer.]]

* ManlyTears: Fred stars sobbing as [[spoiler:Shaggy and Scooby say goodbye to Crystal and Amber]].

* AnalProbing: It is ''very'' subtly implied by Lester that probing was what the aliens who captured him did to him before letting him go.

* BornInTheWrongCentury: Since the film takes place in the 2000s and Shaggy is the only one who still talks like it's the 70s, ''Alien Invaders'' makes it a plot point that he's into 70s lingo and the hippie style. This is why he falls for Crystal, a NewAgeRetroHippie [[spoiler: disguise for an alien]].

* ScoobyDooHoax: [[spoiler: Zig-zagged. The very human villains faked the main alien threat, while the actual aliens are disguised as humans.]]

* VileVillainSaccharineShow: In spite of the LighterAndSofter tone, [[spoiler: Steve, and to lesser extents the fake M.P.'s, Laura and arguably Max, have plenty of moments of sheer, SlasherSmile menace when they have the gang at their mercy and are trying to run down Crystal and Amber.]]

* WhamShot: Crystal and Amber [[spoiler:''turning into blue skinned aliens'' behind Shaggy and Scooby.]]

* BornInTheWrongCentry: Since the film takes place in the 2000s and Shaggy is the only one who still talks like it's the 70s, ''Alien Invaders'' makes it a plot point that he's into 70s lingo and the hippie style. This is why he falls for Crystal, a NewAgeRetroHippie [[spoiler: disguise for an alien]].

* BornInTheWrongDecade: Since the film takes place in the 2000s and Shaggy is the only one who still talks like it's the 70s, ''Alien Invaders'' makes it a plot point that he's into 70s lingo and the hippie style. This is why he falls for Crystal, a NewAgeRetroHippie [[spoiler: disguise for an alien]].

* TalkingAnimal: Amber is revealed to be one at the end while in her dog form, much to the surprise of the gang. Fred comments on the irony, seeing how Scooby already fits the bill.

* ShesGotLegs: Local waitress Dottie isn't bad looking, and we get a lengthy shot of her legs from behind as she walks away.

* ManlyTears: Fred stars sobbing as [[Shaggy and Scooby say goodbye to Crystal and Amber]].

** After running off Shaggy, Crystal and the dogs, one of the M.P.'s growls "I wish we really could bust them." [[spoiler:Providing a hint that their not real M.P.'s]]

* TotallyRadical: Crystal's even worse than Shaggy, seeming like she was plucked right out of the 1960's. [[spoiler:Turns out her race discovered TV and radio transmissions from Earth in the 1960's and simply assumed that everyone still talked and dressed like that.]]

* WrongTurnAtAlbuquerque: Shaggy makes a wrong turn onto government property courtesy of a sandstorm and ''then'' winds the gang up near Roswell after seeing an UFO.

The gang is driving through the Sonoran Desert when a sandstorm comes up and Shaggy makes a wrong turn onto government property but only to lose control of the Mystery Machine when Shaggy sees an UFO and the gang find themselves on the outskirts of small town Roswell where people are supposedly being abducted by aliens. It’s up to the gang to solve the mystery.

* DarkerAndEdgier: The atmosphere is grimmer than usual ''Scooby-Doo'' fare with the threat of aliens lurking in the background, the mystery of what the government is up to, and the quiet town is a pretty bleak setting. However, see LighterAndSofter.

* InterspeciesRomance: Shaggy and Crystal along with Scooby and Amber [[spoiler:because they're aliens]].

* LighterAndSofter: In spite of the grimmer atmosphere, it has [[spoiler:the real aliens as the good guys]] and [[spoiler:[[ScoobyDooHoax disguised humans]] as the bad guys]].

* StarCrossedLovers: A non-lethal version. Shaggy and Crystal along with Scooby and Amber [[spoiler:have to part ways at the end.]]

* VileVillainSaccharineShow: IN spite of the LighterAndSofter tone, [[spoiler: Steve, and to lesser extents The fake M.P.'s, Laura and arguably Max, have plenty of moments of sheer, SlasherSmile menace when they have the gang at their mercy and are trying to run down Crystal and Amber.]]
* VitriolicBestBuds: Sergio the dinner cook and Dottie the waitress throw a lot of insults at each other but seem to work well ok.