Archie's Weird Mysteries

Archie's Weird Mysteries was the most recent^[when?] animated adaptation of the Archie comic book, airing from 1999 to 2000 (two seasons). Unlike the usual goofy nature of the series, this show actually showcased the gang getting into supernatural adventures and having to tangle with monsters, ghosts and other paranormal or extraterrestrial activity. DiC Entertainment provided the animation and the series, while still fairly comedic, actually drifted into dark territory sometimes (though not by much, thankfully; think of something along the line of Goosebumps).

Worth a look if you can find videos or compilation DVDs of it.

Tropes used in Archie's Weird Mysteries include:

Action Girl: Betty and Veronica step up to the task if needed.
A Day in the Limelight: Something is Haunting Riverdale High focused on Dilton building a device that wound up phasing himself, Archie, Midge, and Big Ethel into another plane of existence, basically turning them intangible and invisible. The episode revealed more about Midge and Ethel beyond Midge simply being Moose's girlfriend and Ethel chasing after Jughead. Dilton also sadly notes that the only time anyone talks to him is when they need help with science (which is also true given the episode format). He was missing for an entire day and no one noticed before Archie became intangible. After they get turned back to normal, Archie decides to spend the rest of the day with them.
Aliens Speaking English
All Just a Dream: The episode "Dream Girl" does this.
Alternate Timeline: Alternate Riverdales, the second in a trio of connected episodes focusing on time travel.
Attack of the 50-Foot Whatever: Veronica in one episode which nearly bordered on Fetish Fuel.
Be Careful What You Wish For: Many, many times.
Betty and Veronica: The originals, no less.
Betty, Veronica and Archie Switcheroo: Ironically, this had the Veronica switch her role as this and the Betty with Scarlett Van Helsing, a new student who was asking for Archie's help in researching vampires. They find out that Scarlett is a vampire, part of a cult who wants to resurrect their vampire leader Medlock. Scarlett seduces Archie before planning to kill him; Veronica leads a rescue and uses an amulet to stop Scarlett and her Mooks. Later, Scarlett ends up pulling a Heel Face Turn after Medlock drains her youth and forces her to seek refuge with the Archie gang.
Between My Legs: Both Veronica and Betty in "Dream Girl".
Big Eater: Jughead, as usual.
Book Ends: Some episodes begins and ends with Archie writing an article for his school newspaper. The ending usually has him going over an Aesop and the ending lines being, "In a little town called Riverdale."
The Cassandra: Archie becomes one.
Cassandra Truth: Lampshaded by Reggie in one episode.

Reggie: Newsflash: The World Does Not Revolve Around Archie Andrews and His Overactive Imagination!

Christmas Episode: The Christmas Phantom. The episode is actually based on Santa Claus answering Archie's wish for a weird mystery.
Clark Kenting: Used in Supreme Girl vs. Dr. Arachnid with Supreme Girl and her alias Olga Capucchi.
Contrived Coincidence: Played straight in one episode--in order to stop a giant pudding monster from growing out of hand, they need to drop a rain formula from the sky by someone who has a plane and can drive it. It just so happens that Reggie's uncle has a plane and Pop Tate's has a license to drive one.
Darker and Edgier: It still retains its comedic values, however.
Enemy Mine: Betty and Veronica in "Green-Eyed Monster".

Veronica: Look, we've been rivals long time, right?
Betty: Longer than I could remember.
Veronica: And we're the only two who can fight over Archie, right?
Betty: Wouldn't have it any other way.
Veronica: Then let's join forces and submarine this new Dorsia girl.
Betty: Love, love.

- Scarlet with Archie, Jughead and Reggie when Medlock starts favoring Veronica over her.
Even Reggie Has Loved Ones: He stops a gang of trolls from hurting some kindergateners cause he had a young niece named Amy staying there. He comforts her and make sure she's safe before heading off.
Everything's Worse with Bees: One episode had the gang dealing with mutated bees. In a surprising twist of fate, Big Ethel saves everyone by dousing the Queen with smoke and commanding the other bees to never come back.
Fountain of Youth: In Twisted Youth all the adults become young from drinking bottled water. The reason is because a special crystal was found in the spring that bottled the water and is thus causing them to become young.
Genre Blind: So...after a lot of times where Archie suspects something, and it'd turn out to be real, you'd think that people would realize he's not kidding, right? Nope.
- A couple episodes have people believe this though.
Gentle Giant: In the last episode, we see Moose befriending the rival school's ultimate wrestler who's really a robot
Getting Crap Past the Radar: When Veronica suddenly outgrows her swimsuits and then wraps herself up in a Cabana, many of the partygoers look at her with a smile on their faces...it's pretty clear they saw her naked.
Heel Face Turn: Scarlet, the vampire girl in the second and third episode of the vampire arc.
Hey, It's That Voice!: Archie Andrews would eventually have the last name 'Kaiba' in a certain anime...
Hidden Depths: One episode revealed that Midge is training in gymnastics because she wants to be a stuntwoman, and Big Ethel is knowledgeable of old coins and interested in magic.
Hypocritical Humor: Twisted Youth showed this relating how the adults were trying to kill everyone's fun until we see them as teenagers....
The Huge Mall That Wasn't There Yesterday: An episode has one of these.
Invisibility: One episode has Archie and Reggie becoming invisible. Reggie proceeds to act like the invisible man.
- Another episode had Archie, Dilton, Midge, and Ethel turned invisible and were in another plane of existence.
Ironic Echo: Reggie's line about things being 'too good to be true' and how it relates to the nice robot that replaces him later.

Reggie: (to Veronica) Wake up and smell the rip-off; if something sounds too good to be true, it is!

It's All About Me: Veronica, of course, due to a spell, as you can imagine didn't pan out so well.
I Was Quite a Looker: In Twisted Youth, any adult drinking a specific brand of bottled water become younger. This is especially noted when Miss Grundy turns young.
Jerkass: Reggie. He was already one in the comics, but there he's sometimes been a Jerk with a Heart of Gold.
Magic Pants: Averted in "Attack of the Fifty Foot Veronica".
Mayfly-December Romance: Implied in "Green Eyed monster" where Dorsa outlives her husbands.
- To be fair, She's a sea creature who kept those 'husbands' trapped with her forever. It was just a source of will power for whomever could survive her.
Me's a Crowd: Veronica learns the hard way that the world's alright with only one of her in Me! Me! Me!.
Mundane Solution: In Brain of Terror, the only way to reverse a brain growth helmet that Moose has constantly be using is to cross the wires. Dilton dismisses it until Moose does it in the end. Also counts as a Brick Joke.
Mummy: Seen in Curse of the Mummy. He was a pharaoh who was in love with an ancestor looking similar to Betty...but kept constantly stalling their wedding. When she died, he was so upset that he desecrated all the statue faces, shattered every mirror and even carved off the face of his own sarcophagus. He came back to life after Archie kept taking pictures of him, and stopped when every picture got ripped in half.
Muscle Angst: Archie and Reggie both go through this in the episode Invisible Archie due to Betty & Veronica's attention being focused on some large jock.
Nice Guy: The robot-lookalike of Reggie in Reggie Or Not. The climax features the robot and Reggie trying to out nice each other and Reggie winning because if the robot really was that nice, he'd let Reggie win.
Nice Job Breaking It, Hero: There are some episodes where the trouble is gonna be blame on Archie or his friends.
- Archie buying two dice for his car in "Driven to Destruction" results in his car going to life and goes Yandere on him.
- "Fleas Release Me" has Reggie dressed as a werewolf and scaring Archie, Betty, and Veronica. The consequence is that the sheriff (who is the real werewolf) takes him in custody for the werewolf attacks around Riverdale.
- "Attack of the 50ft Veronica" has the titular character of the episode getting herself zapped with the growth ray. Guess what happens?
- "Green-Eyed Monster" would have Betty and Veronica trying to get rid of Dorsia. Not only the attempts failed, but also Archie losing his trust in them.
- Veronica is unknowingly responsible for getting Dr. Arachnid the needs to defeat Supreme Girl.
Nice Job Fixing It, Villain: Medlock, the vampire master, actually had all the cards that the prophecy foretold would bring about darkness. But then he betrays Scarlet, his most loyal servant, by taking away her youth to revive himself. This backfires when it turns out Scarlet was suppose to be girl to help him take over the world.
Our Werewolves Are Different: Turning into a werewolf requires a werewolf bite, the full moon, and possession of a pentagram (which is only defined as a "five-pointed star", so a sheriff's badge works just fine). Putting something silver on the werewolf will turn it back and prevent further changes.
Prophecy Twist: Used in the 3-story arc upon the chosen one who could defeat Medlock.
Robotic Reveal: Subverted the first two times and then played straight in Reggie Or Not. First, Archie uses a magnet on the Reggie-bot, but it's because the robot has a cookie tray on him. Then, Archie tosses a bucket of water on him, but the robot senses it. Last, Archie is almost run over by a truck and the robot pushes him out of the way...but half of his face got scraped off.

Jughead: Holy Cosmic Muffins! Archie was right!

Reed Richards Is Useless: How the hell does Dilton not get have government agents knocking on the door asking for him to come up with inventions for them to better mankind? Even if a lot of his inventions wind up setting up the plot somehow, it's because they're irresponsibly used or malfunction.
Royal Brat: Veronica.
- But she's shown to learn her lesson.
Secret Test of Character: In "Driving To Distraction", one is given to Archie, due to basically ignoring his friends in favor of his car, so the fuzzy dice he buys make the car go Yandere. Lampshaded by the person who gave him the fuzzy dice, who complains that they "always want to do it the hard way".
Scary Librarian: Shown in A Haunting of Riverdale. The ghost of Quiet Violet is haunting the library for two reasons: 1) to make sure all the people who had overdue books returned them and 2) finally meeting up with Jughead to make amends to their first meeting and encouraging him to go to the library again.
Shout-Out: Betty actually dressed as Lara Croft in Misfortune Hunters.
Shirtless Scene: Archie get's one in the episode Green Eyed Monster. He's surprisingly buff.
Story Arc: Two major ones that made up three-part episodes. One dealt with vampires, and the other dealt with time travel.
Unreliable Narrator: In A Haunting in Riverdale the former head librarian is haunting the town. Jughead remembers going to said library in where she bullied him and scared him away from the library, yelling at him for playing with the globe, telling him a book he was interested in wasn't for little boys, and finally yelling at him to be quiet because he was laughing. However, when the ghost is asked on what happens, she presents a different version. She did come up and tell him to stop playing with the globe because it almost fell down on him. She did take a book he wanted to read away because it was falling apart and was needed to be repaired. And she finally did admit to telling him to be quiet because he was making too much noise.
Witch Doctor: Lucinda, who the gang go to on occasion to help them.
Whole-Plot Reference: Attack of the Killer Spuds to Invasion of the Body Snatchers. There was also Little Chocklit Shop of horrors to 2001: A Space Odyssey.
Wounded Gazelle Gambit: A cute little alien does it to Archie and the gang so he could gain their trust and make an alarm disruptor device so he can collect Riverdale's plutonium and sell it on the black market.