Long ago, in the fantasy world of Kumandra, humans and dragons lived together in harmony. However, when sinister monsters known as the Druun threatened the land, the dragons sacrificed themselves to save humanity. Now, 500 years later, those same monsters have returned, and it's up to a lone warrior to track down the last dragon and stop the Druun for good.

Three different stories of youth set in different cities of China.

Frank Adler (Chris Evans) is a single man raising a child prodigy - his spirited young niece Mary (Mckenna Grace) in a coastal town in Florida. Frank's plans for a normal school life for Mary are foiled when the seven-year-old's mathematical abilities come to the attention of Frank's formidable mother Evelyn (Lindsay Duncan) whose plans for her granddaughter threaten to separate Frank and Mary. Octavia Spencer plays Roberta, Frank and Mary's landlady and best friend. Jenny Slate is Mary's...