Synopsis: Ares is again on the warpath. To counter him, Aphrodite brings forth an army of women, called Amazons. To their leader, Hippolyte, she gives a magic girdle of invincibility. The girdle proves effective against even Hercules, Ares' agent. Though he attempts to steal the girdle through guile, Hippolyte outwits the strongman, defeats Ares, and takes her Amazons to settle in peace at a place called "Paradise Island".
Hippolyte, now styled, "Queen of the Amazons" desires a family. Having been burned badly by Ares and his world of men, she chooses to procreate through non traditional means. Sculpting a figure from clay, she animates it with life and calls her creation, "Diana, Princess of the Amazons".
For an indeterminate, but presumably long, period of time, Hippolyte and her daughter live in the peace Aphrodite intended for them. Then, one day, a man crashes his plane into the island. The man is discovered to be Steve Trevor, a member of the United States Army.
Needing to rid her island of the threat of man, Hippolyte holds a competition to decide which of her Amazon warriors will once again don the magic girdle and return Trevor to the world of men. Diana, knowing nothing of the war with Ares, has fallen in love with Trevor and is therefore eager to be the one to explore Steve's world.
Her mother, though, expressly forbids it. Diana disguises herself, enters the competition, and, with seeming ease, wins the right to accompany Steve home. Knowing that departure from the island means sacrificing the immortality of paradise, Hippolyta tearfully hands over the girdle, a magic lasso that can compel those in its circle to tell the truth, and the rest of the traditional Wonder Woman outfit, to her daughter.
Diana departs in an invisible plane for Washington.