Mamma Mia! is a musical set on a Greek island, centred around Sophie, a young woman about to marry her fiancé, Sky. Sophie wants her father to walk her down the aisle but doesn't know who he is. She discovers her mother Donna’s old diary, which lists three possible fathers: Sam, Bill, and Harry. Sophie invites all three men to the wedding without telling Donna. When they arrive, Donna is shocked, and Sophie tries to figure out which man is her father. The story explores love, family, and identity, with comedic and emotional moments, all set to classic ABBA songs like "Dancing Queen" and "Mamma Mia!". In the end, Sophie finds happiness, and Donna reconciles with her past.