Dream is related to Fantasy. Fantasy is a type of Imagination. Imagination is derived from Imagine. Envision is a type of Imagine. 
you are likely to find Role in/at/on Film. you are likely to find Role in/at/on Movie. 
Dream <--RelatedTo--> Fantasy --IsA--> Imagination --DerivedFrom--> Imagine <--IsA-- Envision 
Film <--AtLocation-- Role --AtLocation--> Movie 