God of the Golden Fleece — Fred Saberhagen

When Proteus crawls from the sea, brain dam-aged from a fight with a terrible giant, all he can put together from his shattered memory is that he was sent to aid Jason and the Argonauts on their incredible mission. As he joins them on their quest, Proteus soon discovers that he is not like other members of the crew. Proteus is capable of inhuman strength; he seems never to grow tired; he has unexplainable control of the sea that surrounds him, and he is able to see things that no one else can. But, there seems to be a dark side to his past he still can't remember, for a number of enemies sent by Jason's arch nemesis, King Pelias, seem to recognize Proteus . . . as being one of them.