The next day, in a Manhattan apartment, two young siblings named Gus and Rosie learn that they cannot be taken to Central Park, because their father Alan has to go to court for an important case, and their mother Hilary has to attend the open house on Park Avenue. While left alone with their nanny, Maria, Gus takes Rosie to the park himself. While playing with Gus' toy boat by the river, Rosie chases a butterfly to the bridge where she mistakes Stanley for her own troll doll. Realizing Stanley is a real troll, she follows Stanley into the cave and befriends him.