DUALROLE
Dual role
Dual role refers to one actor playing two or more roles, which may be deliberately scripted in a play or film, or merely be a by-product of a low budget. In a theatrical production where more than one actor plays multiple characters, it is sometimes referred to as an "Ironman" cast. In film and television, a dual rule is commonly used either for comic effect or to depict identical twins.The above text is a snippet from Wikipedia: Dual role
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