It's a Mystery, Charlie Brown (1974)

Mystery Inc. has cracked the case to top all cases! They’ve tracked down Coco Diablo, the head of a notorious costume crime syndicate. With Coco and her kitty in prison, Mystery Inc. thinks that they can finally enjoy a break. Wrong! Suddenly, menacing doppelgänger ghosts of the Scooby crew and favorite classic foes show up in Coolsville to threaten Halloween. Now it’s up to the meddling kids to unmask the latest scoundrel and save Halloween!

Best friends Tod, a fox kit, and Copper, a hound puppy, visit a country fair when they see a band of dogs called "The Singin' Strays". The band has five members: Dixie, Cash, Granny Rose, and twin brothers Waylon and Floyd. It is important that they perform well because a talent scout is visiting.

After cracking the biggest case in Zootopia's history, rookie cops Judy Hopps and Nick Wilde find themselves on the twisting trail of a great mystery when Gary De'Snake arrives and turns the animal metropolis upside down. To crack the case, Judy and Nick must go undercover to unexpected new parts of town, where their growing partnership is tested like never before.

The Mega Mondo Pop Cartoon-a-Con in sunny California marks the spot for mystery in this all-new original Scooby-Doo adventure! The Mystery Inc. pals -- Fred, Daphne, Velma, Shaggy and Scooby -- head to the annual convention, but they're not there to crack their next case. They want to meet their favorite comic book characters and see a megabucks movie premiere, an explosive big-screen remake of the classic cartoon The Adventures of Blue Falcon, featuring Shaggy and Scooby's favorite superheroes: caped avenger Blue Falcon and his trusty but bumbling robo-pup, Dynomutt.

When a faithful police dog and his human police officer owner are injured together on the job, a harebrained but life-saving surgery fuses the two of them together and Dog Man is born. Dog Man is sworn to protect and serve—and fetch, sit and roll over. As Dog Man embraces his new identity and strives to impress his Chief, he must stop the pretty evil plots of feline supervillain Petey the Cat.

An 11-year old boy believes that he is the best detective in town and runs the agency Total Failures with his best friend, an imaginary 1,200 pound polar bear.

Fred is cast as Ebenezer Scrooge in a stage adaption of the classic Christmas story, but is acting a bit stingy in real life.

The Loud family travel to Scotland and discover they are descendants of Scottish royalty as they move into their giant ancestral castle.

A husband and wife detective team takes on the search for a missing inventor and almost get killed for their efforts.

The Mystery Inc. gang takes a trip to Japan and finds themselves circling Asia and the Pacific in a treasure hunt, racing against the vengeful Black Samurai and his Ninja warriors to find the legendary Sword of Fate, an ancientblade fabled to possess extraordinary supernaturalpowers.