The Ghost Pirates are the ghosts of pirates who looted many ships. With government troops in pursuit, they found an old house to bury their treasure before trying to escape. Before they left, they wrote a contract written in blood stating that they will return at midnight, one hundred years later on Halloween night.
When Garfield and Odie arrive at the house on Halloween night, an Old Man who was once the cabin boy of the crew informs them of what is expected to happen that night. When the ghost pirates arrive, Garfield and Odie try to hide from them, which works until Odie sneezes. After being chased by the ghosts, Garfield and Odie escape by jumping into the lake.