As the film goes back and forth in time to show how relationships forged in the past resonate in the present, James will play the role of Young Donna. Filling the roles of Young Rosie and Young Tanya are Alexa Davies (A Brilliant Young Mind) and Jessica Keenan Wynn (Broadway's Beautiful). Young Sam will be played by Jeremy Irvine (War Horse), while Young Bill is Josh Dylan (Allied) and Young Harry is Hugh Skinner (Kill Your Friends).

"This exuberant sequel easily tops the 2008 musical hit." - Chicago Reader

"A joyful, blissed-out summer treat so sunny that audiences should apply SPF 30 before entering the theater." - Us Weekly