Jonathon Cold is a freelance agent hired by a mysterious man to deliver a package from France to Germany. The contents of the package remain undisclosed, even between employer and employee, but whatever it contains seems to be attracting a swarm of political corruption, backstabbing bad guys and murder. However, Cold knows he must stay one step ahead of the evil powers at work, whoever they are, no matter what the cost, as it increasingly becomes a game of step on or be stepped on.

Jason has been prophesied to take the throne of Thessaly. When he saves Pelias from drowning, but does not recognize him as the man who had earlier killed his father, Pelias tells Jason to travel to Colchis to find the Golden Fleece. Jason follows his advice and assembles a sailing crew of the finest men in Greece, including Hercules. They are under the protection of Hera, queen of the gods. Their voyage is replete with battles against harpies, a giant bronze Talos, a hydra, and an animated skeleton army, all brought to life by the special effects wizardry of Ray Harryhausen.