The Greeks laid siege to the city of Troy after Paris (David Firth) of Troy abducted the beautiful Helen (Ann Pennington) from Sparta. In the city, Troilus (Anton Lesser), brother of Paris, is courting the lovely Cressida (Suzanne Burden), who is playing hard to get so that his interest will be heightened. Outside the walls of Troy, the Greek forces are growing weary of the war. Leader Agamemnon (Vernon Dobtcheff) even finds his prize warrior Achilles (Kenneth Haigh) to be sullen about the proceedings, and is concocting a plan to promote Ajax (Anthony Pedley ) as the Greeks' greatest hero, thereby goading Achilles back into action. To this end, Ajax is chosen when the Trojans suggest a wrestling match with Hector (John Shrapnel), another brother of Paris and Troilus. Meanwhile, Troilus and Cressida consolidate their feelings for one another and spend the night together. The next day, however, Cressida's traitorous father arranges for her to be given to the Greeks in exchange for a captured Trojan. Troilus vows vengeance on Diomedes (Paul Moriarty), the Greek who seduces Cressida, and goes on a rampage in the Greek camp. The fighting spreads, with Hector killing Patroclus (Simon Cutter), beloved of Achilles, and Hector viciously slain in turn by Achilles. The film ends with the war far from over, and Troilus bemoaning the meaninglessness of love and life.