The DVD was released on October 9, 2012, by Warner Home Video, and made its TV premiere on September 8, 2012, on Cartoon Network in the United States.

In Atlantic City, a werewolf breaks into a jewelry store, and steals a ruby necklace setting off an alarm.

The duo tried to stop the hairy thief, but it was too fast for them as the werewolf escaped into the nearby hills, where it overlooked a circus.

They arrive to find that the circus doesn't open until tomorrow, but decide to look around when they notice that the front door is unlocked.

He informs the gang that the werewolf they had encountered has been shadowing the circus for a few months, has scared off many of his artists, and has stolen jewelry wherever they are.

In spite of the attack, the performers receive a big round of applause from the audience, who believe that the werewolves were just part of the show.

Marius informs the gang that they will be doing a private show for Wulfric Von Rydingsvard, a singer from the band Wülfsmöøon which Shaggy admires.

Later on, Velma discovers that a carbonado is also called a black diamond, a jewel that Wulfric owns.

During the chase, Shaggy pulls off one of the werewolves' fur and finds red fur underneath it, and Scooby notices that the cage which had Doubleday's baboons is empty, making them realize the werewolves were just Doubleday and his trained baboons in disguise.

Doubleday tries to escape, but he is tranquilized and caught by Archambault, who claims that he was tied up in a storage shed, but managed to break the ropes.

Schmatko informs Daphne that he has decided to quit his job as a clown and to pursue his dream in the theatre.

Velma remembers that Archambault last heard that the jewel was referred to, not as a 'black diamond', but as a 'carbonado', and recounts that before Doubleday was captured, he said, "You won't take us that easy," meaning that he had an accomplice.

The gang pursue the train and they see Archambault attacking Marius to get to the box office money.

When Doubleday got caught, Archambault double-crossed him in order to buy some time to get away with the jewels and the box office money.