Answer
In the 1977 film "Sorcerer," Roy Scheider portrayed two distinct characters with dual identities. As Jackie Scanlon, a down-on-his-luck American truck driver, he becomes embroiled in a dangerous mission to transport nitroglycerin through treacherous South American jungles. Along the journey, he adopts the alias Juan Dominguez to conceal his true identity and protect himself from adversaries.