The Pallo Mansion Ghosts are villains in The Real Ghostbusters and they were a ghostly couple that haunted a house in Ray Stanz's childhood hometown, Morrisville.
When the aforementioned Ghostbuster visited his old hometown, he is prompted to help his friend, Elaine to rid a house she inherited of its resident ghosts. Ray was overpowered and humiliated by the Class 2's because Ray's old rival Alan Favish had cast a spell that enveloped the ghosts with negative energy, making regular ghostbusting equipment useless.
The Class 2's left the mansion and ruined the Winged Puma Parade. By the time the other Ghostbusters came to help Ray, the spell had worn off, enabling them to easily capture the two ghosts.