Hercules and his friends are summoned by Mentor to Titan, home of the space Eternals. Here the Sun god Apollo lies at death's doorstep. Apollo warns his brother of their father's insanity and the murder of the Olympian gods. But first Hercules must contend with Shreck, a disciple of the mad titan Thanos. Can even the Lion of Olympus stand against a villain who possesses the power of the deceased Captain Marvel's Nega-Bands?