The Gorilla

Scooby-Doo and the Mystery Gang visit Oakhaven, Massachusetts to seek strange goings on involving a famous horror novelist and his ancestor who is rumored to have been a witch.

Relatives gather at a haunted mansion for a will reading where the sole heir is threatened by a clause that could disinherit her if she goes mad, all while a homicidal maniac escapes nearby.

When the Mystery Inc. gang is invited to Spooky Island, a popular amusement park, they soon discover that the attractions aren't the only things that are spooky. Strange things are happening, and it's up to Scooby, Shaggy, Fred, Daphne, and Velma to uncover the truth behind the mysterious happenings.

Lost Caverns Resort Hotel bellhop Freddie Phillips gives an empty threat to one attorney Amos Strickland, and is shortly fired. When Freddie visits his guest's suite to apologize, he finds Strickland dead of a gunshot wound. As the investigators file in, Freddie becomes the scapegoat of the guests in the hotel, who all had a bone to pick with Strickland. It's now up to Freddie and Detective Casey Edwards to find out who the real killer is, all the while avoiding the many vigorous and violent villains staying at the resort.