The Black Widows, a teenage girl gang, find one of their number killed. They blame her murder on Barbara, the on-again-off-again girlfriend of the leader of rival gang The Vandals. As the gangs prepare for a fight, we take a glimpse into their tumultuous home lives.

King Androcles of Thebes commands a ship in search of a threat to Greece, predicted by an atmospheric oracle. Hercules is part of the crew, but the strongman falls overboard in a thick fog. Washed ashore, he saves a young Ismene from Proteus, an evil, shape-shifting creature. Ismene takes Hercules to Atlantis, where he discovers that her mother, Queen Antinea, has captured Androcles. Hercules schemes to rescue him and thwart Antinea's dream of world conquest.