When Gelsomina, a naïve young woman, is purchased from her impoverished mother by brutish circus strongman Zampanò to be his wife and partner, she loyally endures her husband's coldness and abuse as they travel the Italian countryside performing together. Soon Zampanò must deal with his jealousy and conflicted feelings about Gelsomina when she finds a kindred spirit in Il Matto, the carefree circus fool, and contemplates leaving Zampanò.

In Pompeii in the year 79, Lycias and Helen fall in love. Helen's guardian, the high priest of Isis, wants to separate them. To do so, he tries to make Lycias drink a love potion, but a young slave threatens to reveal everything. The high priest, unable to silence her, kills her and arranges to have Lycias accused...