Mary Lennox is born in India to wealthy British parents who never wanted her. When her parents suddenly die, she is sent back to England to live with her uncle, Archibald Craven. She meets her sickly cousin Colin and the two children find a wondrous secret garden lost in the grounds of Misselthwaite Manor.
Queen Poppy and Branch make a surprising discovery — there are other Troll worlds beyond their own, and their distinct differences create big clashes between these various tribes. When a mysterious threat puts all of the Trolls across the land in danger, Poppy, Branch, and their band of friends must embark on an epic quest to create harmony among the feuding Trolls to unite them against certain doom.