A mysterious "spaceship" floats over a baseball game, eventually revealing Fatso, Stinky and Stretch, The Ghostly Trio, who cause panic in the ballpark. Their nephew Casper, a shy, friendly ghost attempts to settle the agitated crowd, but the people are equally scared of him. The park empties, and Casper's uncles plan a vacation.
Meanwhile, an evil warlock named Desmond Spellman who believes himself the greatest warlock to have existed gets an unwelcomed messaged by the Oracle in the Mirror who tells him that in the future, a 10-year-old named Wendy the Good Little Witch will surpass him in being the greatest witch ever. In response, Desmond plans to get rid of her with the advised "Mystic Abyss". He creates two henchmen: Jules and Vincent, and assigns them to bring Wendy to him.
Wendy is living in the country with her three witch aunts, Gert, Gabby, and Fanny. Jules and Vincent arrive to abduct Wendy, who narrowly escapes with her aunts. To keep Wendy safe from Desmond, her aunts hide and vacation at a resort hotel, which happens to be the same in which Casper and his uncles are vacationing.
Casper and Wendy meet in a barn and, due to their nice personalities and having been bossed around by their respective relatives, become great friends. Realizing that her aunts and his uncles might not get along because ghosts and witches are natural enemies, Casper gets his uncles to haunt a dance, to which Wendy convinces her aunts to attend. The Ghostly Trio possess three men at the party and flirt with the three witches.
Though everything seems to go well, the plan is foiled when the possession wears off and the ghosts' real selves are revealed to Wendy's aunts, who threaten them with magic. However, as Wendy explains to Casper, she and her aunts can't use powerful magic or else Desmond will be able to track them down. She begs Casper not to tell anyone about this. Unfortunately, when the Trio suspects Casper is protecting the witches, they pressure Casper into confessing that the witches cannot use their magic, prompting the Trio to attack Wendy and her aunts. Wendy feels she has no choice but to cast a spell on them, covering them in plaster, thus alerting Desmond's magic tracker.
Wendy, distraught that Casper broke his promise, ends their friendship. After trying to escape the resort the witches are then found by Desmond and his henchmen. After confronting the witches Desmond explains the Oracle's prediction and after trying to resist him Desmond casts Wendy into the Mystic Abyss to destroy her, but Casper dives in to save her. Her aunts try to fight Desmond but are not powerful enough. Yet before Desmond can turn the witches into fertilizer, a giant three-eyed monster pops up and frightens the evil warlock, turning the tables and along with Wendy's broom pushing him causing him to fall into the Abyss himself. The monster turns out to be the Ghostly Trio, who combined their powers to defeat him. While they hold the Abyss open, Wendy's aunts pull her and Casper out. Now saved, the two reconcile their friendship. The Oracle proclaims that Wendy is the greatest witch because she did something no other witch ever could: She befriended a ghost. Casper, his uncles, Wendy, and her aunts all bid each other goodbye, and Casper and Wendy assure each other they will meet again soon.
MainHilary Duff as Wendy the Good Little WitchCathy Moriarty as GertShelley Duvall as GabbyTeri Garr as FannyGeorge Hamilton as Desmond SpellmanRichard Moll as JulesVincent Schiavelli as VincentPauly Shore as The OracleBlake Foster as Josh JacksonLogan Robbins as LoganMichael McDonald as Spike-StretchTravis McKenna as Phil-FatsoPatrick Richwood as Vinne-StinkyJeremy Foley as Casper the Friendly GhostJim Ward as StretchBill Farmer as StinkieJess Harnell as FatsoRodger Halston as Larry TullbyAlan Thicke as Baseball AnnouncerCasper Van Dien as Crewcut HunkBilly Burnette as ChefMaria Ford as Playmate (Fanny)Jim Jackman as Jerry JackmanSheila Travis as Jean JackmanClay Crosby as HoneycakesTamie Lea Logan as Squeekums (Credited as Tami Logan)Ramsey Krull as NewsboyPaul Di Franco as Spectactor (Credited as Paul di Franco)Howie Gold as Agitated FanCharles Moore as Amazed FanEmily Jennifer Grunfeld as Pretty FanManny Fernandez as Handsome FanMichael Spagnoli as Panicked FanJim Wise as Hungry FanRicky Luna as CatcherJohn Rizzi as Cubana BoySebastian Hitzig as Desk ClerkPatricia Elliott as Snotty Woman (Credited as Pat Elliot)Sue Ellen Enright as MaidCecile Krevoy as Snooty LadyRodman Flender as Agile DancerMichelle Marie as Rockin' DancerLisa Salazar as Smart DancerElizabeth Gage as Swift DancerKaren Welch as Spinning DancerRick Dean as Table OccupantLacey Taylor Robbins as KimLarry Robbins as Boogie-Lovin' DudeNorm Macdonald as Human StretchSean McNamara as Wendy's BroomHugo Orellana as Baseball PlayerBen Stein as LawyerClaire Bryétt Andrew as Startled BabyLex Robbins as Boy at PoolJoel Ross as Hotel Desk Clerk
In the original airing and VHS release of the film, the Casper theme can be heard in the opening sequence performed by Shana Halligan. In subsequent DVD releases the lyric is muted though the melody and sound effects remain intact, however, Halligan is still credited with performing the theme song.
Awards and nominations
Casper Meets Wendy won the Children’s Programming - Electronic Visual Effects award. Hilary Duff was nominated for an Young Artist Award.