The Ghostly Trio (a.k.a. Stretch, Fatso and Stinkie) (voiced by Joe Nipote, the late Joe Alaskey and Brad Garret) are the uncles of Casper. They really enjoy scaring people and pulling pranks. They wanted to scare Dr. Harvey out of the house, but later befriend him. They even get in contact with Dr. Harvey's deceased wife in gratitude for giving them the most fun they've had in years.
- The Ghostly Trio will meet Jeffrey, Jaden and their team in Jeffrey, Jaden & Friends meet Casper.
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