Maisie Williams as Electra, Princess of Argos. She and her brother Orestes plotted revenge against their mother Clytemnestra and stepfather Aegisthus for the murder of their father, Agamemnon. Electra was absent from Mycenae when her sacrifice their eldest daughter, Iphigenia, to Artemis so he could send his ships to fight in the Trojan war. When he came back, he brought with him his war prize. Orestes killed Clytemnestra and Aegisthus, but he was cursed by the Erinyes.