Original cast members Meryl Streep, Pierce Brosnan and Colin Firth are all in talks to return for more Abba-inspired fun in Mamma Mia: Here We Go Again.

The long-rumoured Mamma Mia! sequel now looks certain as Universal Pictures is moving forward with plans for a follow-up film.

In a further development, The Best Exotic Marigold Hotel's Ol Parker has been hired to direct a musical that world be both a sequel and a prequel to the Golden Globe-nominated original.

The scenes set in the past would feature new actors playing Donna (Streep) and her three admirers singing ABBA songs that didn't feature in the original Mamma Mia's soundtrack.

Abba: a Mamma Mia sequel and a stage musical on the way

Streep has been lobbying for Mamma Mia: Here We Go Again ever since the first film became a global box office hit, making more than $600 million back in 2008.

For a long time, it was ABBA songwriters Benny Andersson and Björn Ulvaeus who resisted the temptation to film a sequel, but obviously any reservations they had in the past have been resolved.

Mamma Mia: Here We Go Again is currently being planned for a July 20, 2018 release, and its production crew will include the original stage musical's co-creator Judy Craymer.

In more ABBA-related news, entertainment impresario Simon Fuller is working on a live musical experience that will digitally reunite all four ABBA members, with details expected to be announced later this year.

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