The 'Mamma Mia!' franchise, with its 2008 film and 2018 sequel, has generated over $1 billion globally. The cast, including Meryl Streep, Amanda Seyfried, and Colin Firth, are enthusiastic about a third installment, with Streep suggesting she would return as a reincarnated Donna. Universal Pictures chairman Donna Langley is interested, but Seyfried noted that updated salaries for the cast could affect the project's feasibility.