While there have been various TV and film adaptions starring Scooby-Doo and the gang, it all started in 1969 with the animated series Scooby-Doo, Where Are You? Debuting on CBS and later airing in syndication on Cartoon Network, the show followed an eclectic group of friends and their best bud Scooby as they solved mysteries that led them to face several memorable monsters.

RELATED: Shaggy and Scooby Dress Up as Each Other in New ‘Trick or Treat, Scooby Doo!’ Clip

While these classic monsters were typically criminals in disguise, some ghosts and mummies have remained iconic for decades after being caught by those meddling kids, while one fought for the top spot thanks to Reddit users.

The Black Knight

The Black Knight appeared in the series premiere “What A Night For A Knight” when this villain comes to life during every full moon to scare away visitors from the County Museum in order to host an art forgery scheme.

As the very first monster in the franchise, when the gang finally catches him, they reveal this infamous Black Knight is actually the museum curator Mr. Wickles.

The Phantom Shadows

The Season 1 episode “A Night Of Fright Is No Delight” stars not one, but two monsters called The Phantom Shadows. These green ghosts wearing chains haunted a mansion and kidnapped its heirs in order to get the fortune for themselves.

But when these phantoms then go after Scooby-Doo, his friends plot…