History WesternAnimation / ScoobyDooMoonMonsterMadness

** Shaggy and Scooby dancing on the moon to the Beautiful Blue Danube, a call back to ''2001: A Space Odyssey.''

** The Alien is designed much like a Xenomorph from Film/{{Alien}}.
** The "alien hunting specialist" is named Ridley, and is a clear parody of [[Film/{{Alien}} Ellen Ripley]]. She also makes the [[Series/StarTrekTheOriginalSeries Vulcan salute]] at one point.

The film is the 24th installment of the ''WesternAnimation/ScoobyDooDirectToVideoFilmSeries''.

* AbhorrentAdmirer: Clark Sparkman to Velma. Initially, anyway.
* AllUpToYou: Daphne fills this role at the film's climax.

* MythologyGag: The gang retelling an alien invasion from different perspective is a call back to a WesternAnimation/APupNamedScoobyDoo episode.

** Also, Daphne flipping her hair after suggesting it was a source of Velma's jealousy.

* TheSociopath: [[spoiler:[[BigBad Shannon]] has to be one of the most monstrous Scooby-Doo antagonists in the franchise.]]

--> '''Sly''' ''([[spoiler: about to be marooned on the moon]])'': "You're just going to leave me here?"
--> '''Hudson''' ''(standing behind him, [[spoiler: also about to be marooned]])'': <pointed cough>
--> '''Sly''': "Oh, right. You're just going to leave me here ''with these people?''"

* HeKnowsTooMuch: Preemptively. [[spoiler: Shannon is GenreSavvy enough to know that Mystery Inc will ''probably'' uncover her plot, so she planned all along to prepare for it - by leaving anyone who could tell anyone of her plans to die in space.]]

* SingingVoiceDissonance: U-Boat, a bulky man with a deep voice, has a soprano singing voice.

* [[HeKnowsTooMuch They Know Too Much]]: Preemptively. [[spoiler: Shannon is GenreSavvy enough to know that Mystery Inc will ''probably'' uncover her plot, so she planned all along to prepare for it - by leaving anyone who could tell anyone of her plans to die in space.]]

* HeKnowsTooMuch: Preemptively. [[spoiler: Shannon is GenreSavvy enough to know that Mystery Inc will ''probably'' uncover her plot, so she planned all along to prepare for it - by leaving anyone who could tell anyone of her plans to die in space.]]

* TheSociopath: [[spoiler:[[BigBad Shannon]] has to be one of the most monstrous Scooby-Doo antagonists in the franchise.]]
* UnRoboticReveal: [[spoiler: H.A.M. is revealed to not be an android, but a flesh and blood human actor.]]

* MythologyGag: The gang retelling an alien invasion from different perspective is a call back to a WesternAnimation/APupNamedScoobyDoo episode

** Multiple people coming out of elevators and saying, "The alien. You caught the alien."

--> '''Sly''': "Oh, right. You're just going to leave me here ''with these people?"''

* Un-RoboticReveal: [[spoiler: H.A.M. is revealed to not be an android, but a flesh and blood human actor.]]

* TheSociopath: [[spoiler:[[BigBad Shannon]] has to be one of the most monsterous Scooby-doo antagonist.]]

* ThisLooksLikeAJobForAquaman: Shaggy and Scooby get a moment to help save the day when an entrance is blocked by boxes of food.

* ThisLooksLikeAJobForAquaman: Shaggy and Scooby get a moment to help save the day when an entrance is blocked by boxes of food.
* YouKnowTooMuch: Preemptively. [[spoiler: Shannon is GenreSavvy enough to know that Mystery Inc will ''probably'' uncover her plot, so she planned all along to prepare for it - by leaving anyone who could tell anyone of her plans to die in space.]]

* HiddenDepths: Football star U-Boat, nicknamed for his rough style of playing, is quite the singer.

* TheChessmaster: [[spoiler: Shannon's EvilPlan was thought up months in advance, with every variable controlled and most contingencies planned for - ''[[DangerouslyGenreSavvy including the heroes solving the case.]]'']]

* HiddenDepths: U-Boat is quite the singer.

* OverlyLongGag: Multiple people coming out of elevators and saying, "The alien. You caught the alien."

** Shaggy and Scooby dancing on the moon to the Beautiful Blue Danube, a call back to 2001ASpaceOddessey.

* YouKnowTooMuch: Preemptively. [[spoiler: Shannon is GenreSavvy enough to know that Mystery Inc will ''probably'' uncover her plot, she she planned all along to prepare for it - by leaving anyone who could tell anyone of her plans to die in space.]]

** Sly Baron himself. He's self-absorbed to the detriment of everyone around him, which includes carelessly leaeving his brother to live on the moon for months without contact simply to create an enormous ego-project dedicated to himself. He takes credit for everything, even though he barely ever does anything, and his EstablishingCharacterMoment even has him show up in a suit made of money just to show off his wealth. Summed up in an exchange late in the movie.