Sean Penn has joined the all-star cast of immigration drama CROSSING OVER, but he'll only spend three days on the set filming a cameo as a US border patrol agent. Harrison Ford will star in the harrowing new film, as a crack enforcement agent seeking out illegal immigrants. The movie, ironically directed by neutralised US citizen Wayne Kramer - who was born in South Africa - will also feature Ray Liotta. The movie is sure to become a talking point as it features CRASH-like scenes of human intolerance. In one scene, an Australian actress offers herself up sexually to an immigration officer to land a green card, while Ford's character drags a Mexican mother, waiting for her young son, from her home without allowing her to say goodbye.