Rory is afraid of winter's darkeness. So Rory makes a Winter Dragon of emerald green, with a crest of brilliant red. Each night the dragon comes alive to tell stories of knights and battles, of elf-kings and treasure-hoards – and through his dreamtime adventures, Rory grows brave. But as spring approaches, the Winter Dragon dreams of returning to his fiery home.

Mae Rory yn ofni tywyllwch y gaeaf, felly mae'n creu Draig Aeaf o wyrdd emrallt, gyda chrib goch. Daw'r ddraig yn fyw bob nos i adrodd straeon am farchogion a brwydrau, am frenhinoedd y tylwyth teg a chuddfeydd o drysor - a thrwy'r anturiaethau nosweithiol hyn mae Rory yn magu dewrder. Ond wrth i'r gwanwyn agosáu, mae'r Ddraig Aeaf am ddychwelyd i'w gartref tanllyd.