<P> Sophie Sheridan is preparing for the grand reopening of her mother Donna's hotel, following Donna's death a year earlier . She is upset because two of her fathers, Harry and Bill, are unable to make it to the reopening and she is having trouble in her relationship with Sky, who is in New York, over her memorializing her mother's life . </P> <P> In 1979, a young Donna graduated from Oxford's New College with Rosie and Tanya, and prepares to travel the world . In Paris, she meets and parties with Harry . They spend the night together, but Donna leaves soon after . She later misses her boat to Kalokairi but is offered a ride by Bill, and along the way, they are able to help a stranded fisherman, Alexio, make it in time to stop the love of his life from marrying another . Unbeknownst to Donna, Harry has followed her to Greece; but he arrived too late, and sadly watches the boat sailing off in the distance . </P> <P> In the present, Tanya and Rosie arrive to support Sophie with the reopening and it's revealed that Rosie and Bill have split up . Sophie then visits Sam, who is still grieving over the death of Donna . Back in the past, Donna arrives on the island and while exploring the farmhouse, a sudden storm causes her to discover a spooked horse in the basement . She goes in search of help only to find a young Sam riding his motorcycle and he helps her to save the horse . Back in the present, a storm has caused serious disruption to Sophie's plans for the grand reopening and prevented media coverage of the event . </P> <P> Back in the past, Donna and Sam are enjoying a whirlwind romance, that ends when Donna discovers a picture of Sam's fiancée in his drawer . A devastated Donna demands that Sam leave the island . In the present, Sam tells Sophie about her value to her mother . Meanwhile, Harry leaves his business deal in Tokyo to support Sophie, and separately Bill gets the same idea . Bill and Harry meet at the docks but are told there are no boats . However, Alexio gives Bill, Harry and the newly arrived Sky boat passage . </P>

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