The ensemble and the three main characters are introduced during the surreal prologue: Finn McCool (a non-dancing role played by Tony Kemp), high king of Ireland; Diarmuid (Colin Dunne), captain of the Fianna—Finn's army; and Grania (Jean Butler), Finn's betrothed.
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In the 1999 Irish dance show, "Dancing on Dangerous Ground", Gráinne is played by former Riverdance star, Jean Butler.