Yes, Johnny Depp appears in "The Imaginarium of Doctor Parnassus." He plays one of the alternate personas of the character Tony, who is originally portrayed by Heath Ledger. Following Ledger's passing during the film's production, director Terry Gilliam creatively decided to use different actors, including Depp, Jude Law, and Colin Farrell, to portray various aspects of Tony's character in the fantastical world of the Imaginarium.

"The Imaginarium of Doctor Parnassus" is a visually imaginative film directed by Terry Gilliam, known for its surreal storytelling and rich visuals. The movie explores themes of redemption, temptation, and the battle between good and evil, featuring a unique narrative that blends fantasy with reality. Heath Ledger's untimely death during production led to the use of Johnny Depp, Jude Law, and Colin Farrell to complete his role, adding an intriguing layer to the film. While it received mixed reviews, many appreciate its creativity and artistic ambition.

Heath Ledger did not finish filming "The Imaginarium of Doctor Parnassus" due to his untimely death in January 2008. At the time of his passing, he had completed about half of his scenes. To complete the film, director Terry Gilliam creatively used three actors—Johnny Depp, Jude Law, and Colin Farrell—to portray different versions of Ledger's character in the fantastical world of the Imaginarium. This allowed the film to honor Ledger's performance while continuing the story.

In "The Imaginarium of Doctor Parnassus," the character Tony is played by Heath Ledger, who passed away during filming. To address his absence and complete the story, director Terry Gilliam creatively introduced three other actors—Johnny Depp, Jude Law, and Colin Farrell—to portray different aspects of Tony as he travels through the fantastical world of the Imaginarium. Each actor represents a different facet of Tony's character, reflecting his transformation and the choices he makes in the narrative.