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Jason and the Argonauts, American fantasy film, released in 1963, that loosely retells the Greek myth of Jason and features some of the most notable special effects devised by stop-motion animator Ray Harryhausen. Pelias (played by Douglas Wilmer) murders Aristo, his half-brother, to become king of Thessaly. Years later Pelias tries to prevent Aristo’s son, Jason (Todd Armstrong), from making claims to the throne by sending him on a dangerous quest to find the fabled...