A dual role refers to one actor playing two roles in a single production. Dual roles may be deliberately written into a script, or may instead be a choice made during production, often due to a low budget. In film and television, dual roles are often used for comic effect, or to depict identical twins or relatives. In a theatrical production where more than one actor plays multiple characters, it is sometimes referred to as an "Ironman" cast.

King Lear is a tragedy written by William Shakespeare. It is loosely based on the mythological Leir of Britain. King Lear, in preparation for his old age, divides his power and land between his daughters Goneril and Regan, who pay homage to gain favour, feigning love. The King's third daughter, Cordelia, is offered a third of his kingdom also, but refuses to be insincere in her praise and affection. She instead offers the respect of a daughter and is disowned by Lear who seeks flattery. Regan and Goneril subsequently break promises to host Lear and his entourage, so he opts to become homeless and destitute, goes insane, and the French King married to Cordelia invades Britain to restore order and Lear's rule. In a subplot, Edmund, the illegitimate son of Gloucester, betrays his brother and father. Tragically, Lear, Cordelia and several other main characters die.