When Barb campaigns for a nation under Rock, Queen Poppy, Branch and the gang set out to unite all the Trolls and save the genres from going extinct.

When the eternally optimistic Poppy, queen of the Trolls, learns that the Bergens no longer have any holidays on their calendar, she enlists the help of Branch and the rest of the gang on a delightfully quirky mission to fix something that the Bergens don't think is broken.

When their fellow Trolls are captured by hungry Bergens, upbeat Princess Poppy and her grouchy pal Branch embark on the adventure of a lifetime.