It's been two years since Poppy and Branch became an official couple and have been reunited with their long-lost siblings... The Pop Trolls decide to throw a party to celebrate the harmony between the kingdoms, but a series of unwanted events and unexpected visitors cause the trolls to change their nature again. The extinct Disco tribe has returned to take revenge on everyone who underestimated their potential, kidnapping Poppy's closest friends and the love of her life into outer space. Now it's up to our beloved queen to rescue the ones that matter the most to her in a dangerous musical adventure...