Jason, leader of the Argonauts, embarked on a quest to retrieve the Golden Fleece from the land of Colchis. The fleece was guarded by a dragon and held magical properties. Jason assembled a crew of heroes including Heracles, Castor and Pollux, and Atalanta. After facing various challenges along the way, Jason obtained the fleece with the help of Medea, a sorceress, and returned home successfully.