Mamma Mia! Here We Go Again New Cast Members

Jeremy Irvine and Pierce Brosnan as Sam

The 28-year-old English actor, whom you've probably seen in projects like War Horse and Stonewall, will play a younger Sam.

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Hugh Skinner and Colin Firth as Harry

Image Source: Universal Pictures

The 33-year-old Fleabag actor will play a younger Harry.

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Josh Dylan and Stellan Skarsgard as Bill

Image Source: Universal Pictures

The former Allied star will play a younger Bill.

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Alexa Davies and Julie Walters as Rosie

Image Source: Universal Pictures

The 23-year-old actress, of Harlots and Grantchester fame, will play Rosie in flashbacks.

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Jessica Keenan Wynn and Christine Baranski as Tanya

Image Source: Universal Pictures

The 32-year-old, who previously appeared in The Mysteries of Laura and Billions, will appear as Tanya in flashbacks.

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Lily James and Meryl Streep as Donna

Image Source: Universal Pictures

The 29-year-old Baby Driver actress will be stepping into the iconic role of Donna.

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