Harry, Ron and Hermione in Mickey's Philharmagic is an all-new upcoming Harry Potter crossover movie by Shadow101815. It will appear as a triple feature to Harry, Ron and Hermione Meets Cinderella 2: Dreams Come True, and Harry, Ron and Hermione Meets Cinderella III: A Twist in Time on Google Drive in the near future.
Mickey Mouse is performing with his PhilharMagic Orchestra at the Fantasyland Concert Hall. Inside, there are posters advertising the Concert Hall's past productions and performers, such as Hades from Hercules, Genie from Aladdin, The Big Bad Wolf, and The Three Little Pigs. Upon entering the theater's lobby, guests pick up their "opera glasses" (3-D glasses). During their wait, guests hear orchestral music from Fantasia, Fantasia 2000 and other Disney animated films.
Goofy, the Concert Hall's stage manager, admits the guests into the main theater, where final preparations for the performance are underway. Unfortunately, Donald Duck along with Harry Potter and the others have gone missing just as Goofy raises the curtains to reveal that the stage is empty, save for a conductor's podium and a small steamer trunk, within which Donald is sleeping. Mickey asks Harry, Donald and the others to unpack the instruments, then places his famous Sorcerer's Hat on the podium, telling Donald not to touch it.
After Donald unpacks all the instruments, including a grand piano, from the small trunk, he is tempted to try on the Sorcerer's Hat himself. He does so, which causes the magical instruments to come to life and play an extremely dissonant melody. However, when Donald bullies a small flute, the other instruments rebel, creating a whirlwind of magic and music. They loses the hat in the maelstrom and passes through scenes from Beauty and the Beast, Fantasia, The Little Mermaid, The Lion King, Peter Pan and Aladdin while trying to retrieve the hat.
Ultimately, Donald, Our retrieves the hat, only to have it knocked away by Iago. Donald and our heroes jumps after it, returning to the musical maelstrom that he had left earlier. Mickey returns, grabs the hat and uses its powers to restore order. As a fitting end, Donald gets knocked into a tuba and is then shot from the stage and into the theater's back wall.