The Imaginarium of Doctor Parnassus

The cast couldn't save the movie.
I fell asleep halfway through the story.
I expected more from it, but at the end,
I still couldn't make head and tail of what the movie is all about.

Cast: Heath Leger, Johnny Depp, Judd Law, Colin Farrell (all acting the same person)
Synopsis taken from Cathay website:
In the present day, immortal thousand-year-old Doctor Parnassus leads a travelling theatre troupe that offers audience members a chance to go beyond reality through a magical mirror in his possession. Parnassus had been able to guide the imagination of others through a deal with the Devil, who now comes to collect on the arrangement, targeting the doctor's daughter, Valentina. The troupe, which is joined by a mysterious outsider named Tony, embark through parallel worlds to rescue the girl.