Interstella 5555: The 5tory of the 5ecret 5tar 5ystem (2003)

An unscrupulous music executive and his flunky kidnap an alien, blue-skinned techno band, rob them of their identities, pass them off as human, and foist them on an unsuspecting public on Earth. After their arrival and their impact on the human population, the members of the band try to piece back their identities, escape from the clutches of the evil music executive, and return to their own world.