Scooby-Doo and the Island Cats

This Idea takes place, right after Scooby-Doo Return to Zombie Island.

Premise
While the rest of the gang are waiting for a new ferry to pick them up from Moonscar Island, Scooby-Doo has an adventure with the Island Cats, and also learn about the Island Cats' origins, unaware of an evil plot in the form of two ancient spirits, who intend to do harm to the cats...

Synopsis
On Moonscar Island, while the rest of Mystery Inc. is resting up for tomorrow, Scooby-Doo is wandering around, unknowingly followed by a few cats. After Scooby noticed that the cats were following Him, He goes faster, Then, while running to get away from the cats, He accidentally bumps into to silhouetted figures, who were putting some cats in cages. The two figures fled, and they declared that they’d be back. With that, Scooby scaredly frees the caged cats, thinking that He’d be attacked, since the last two incidents. But the cats purred around the bewildered Great Dane, as one of the cats (A gray-furred one) placed a paw on Scooby’s head, telepathically thanking Scooby. Then, in an instant, Scooby finds Himself in Ancient Greece, where the cats originated. Scooby also learned that some of the cats left the comfort of Greece to explore the world, they however, became feral, as the illusion ended. Back in reality, knowing that the two figures would come back, the Cats go back into hiding, except for one who is very sick.