- Directors: Brad Silberling, Animation, Phil Nibbelink, Eric Armstrong
- Producers: Colin Wilson, Steven Spielberg
- Writers: Sherri Stoner, Deanna Oliver, Characters, Joseph Oriolo
- Genres: Comedy, Family, Fantasy
- Actors: Christina Ricci, Bill Pullman, Malachi Pearson, Cathy Moriarty, Eric Idle, Devon Sawa
The movie begins with two boys Nicky (Chauncey Leopardi) & Andreas (Spencer Vrooman) sneaking into the old, run-down manor of Whipstaff as part of a dare. They attempt to take a picture of themselves as proof, however they soon run into Casper (voice of Malachi Pearson) a ghost, heard off-screen, and are frightened away.
Meanwhile, Carrigan Crittenden (Cathy Moriarty) is furious to learn from her late father’s lawyer Mr. Rugg (Ben Stein) that she has only inherited the manor in her father’s will, rather than anything of significant value. Infuriated, she tosses the will and deed into a fireplace but it is rescued by her attorney and close associate Paul “Dibs” Plutzker (Eric Idle). Dibs discovers one of the will’s pages has an inscription on it describing treasure hidden in the manor.
Carrigan and Dibs visit the old manor, but find it is haunted by four ghosts: Casper (voice of Malachi Pearson), a friendly but lonely young ghost who tries to befriend them but warns them not to scream and his three obnoxious uncles known as the Ghostly Trio: Stretch (voice of Joe Nipote) the subliminal leader who loves to be wise towards others and hates mortals, Stinkie (voice of Joe Alaskey) a ghost who has buck-teeth and is most likely deceased because of mouth cancer or gingavitis for he has putrid breath, and Fatso (voice of Brad Garrett) an increddibly fat ghost who is idiotic, selfish and always hungry wake up and haunt the two for a minimal amount of time. The two make several attempts to remove these spirits, but despite the efforts of Father Guido Sarducci (Don Novello), Ghostbuster Dr. Ray Stantz (Dan Aykroyd) and a demolition crew, they are unsuccessful.
Just as Casper is about to use the machine to revive himself, Dr. Harvey shows up as a ghost, accompanied by the Ghostly Trio. He has already forgotten his previous life. But Kat manages to remind him (using the pinky swear), and Dr Harvey realizes that he has died and left his daughter behind without a father. Realizing that Kat needs her father alive, Casper uses the Lazarus machine to revive him, giving up his own chance of returning back to life. The Halloween party begins while Casper sits alone in his room, alone and disappointed. Suddenly, he is visited by Amelia Harvey (Amy Brenneman) Kat’s deceased mom, who is now an angel. Amelia rewards Casper for his noble act by temporarily reviving him for one night, until 10pm. Meanwhile, at the party, Kat ends up being the only person without a partner. But then a boy (played by Devon Sawa) appears before her and they dance. He soon reveals himself to be Casper and they embrace. Dr. Harvey is then visited by Amelia as well, who advises him on being a good father for their daughter, and then returns to the afterlife. At the final stroke of 10, Amelia disappears and Casper and Kat kiss just as Casper turns back into a ghost, scaring all the Halloween Party guests away. The Ghostly Trio then start playing a rock and roll version of ‘Casper the Friendly Ghost’ and Kat, Casper and Dr. Harvey dance around the hall.