Stanley is a kindhearted, popular troll who can create flowers with a mere touch. When small-minded Queen of the Kingdom of Trolls Gnorga discovers Stanley's miraculous ability, she banishes him to a much far place where she believes nothing green can grow - New York City! Taking refuge in Central Park, Stanley befriends two young children, Gus and his baby sister Rosie. The three share wonderful adventures until Gnorga learns the situation and vows to ruin it all.