Act One The play opens with a fearful Oedipus lamenting a vicious plague which is affecting Thebes, the city over which he rules. People are dying in such huge numbers that there are not enough of the living to ensure that each of the victims is cremated. He also mentions a prophecy that he had received from
Apollo before he came to Thebes that he would kill his father and marry his mother. He had thus fled the kingdom of his father Polybus. However, Oedipus is so disturbed by what is occurring in Thebes that he even considers returning to his home city. But Jocasta strengthens his resolution, and he stays.
Act Two Creon returns from the
Oracle at Delphi with the instruction that Thebes is required to avenge the death of the former King Laius if the citywide plague is to end. Oedipus utters an ironic curse on the yet unrevealed killer, wishing for him "the crimes that I have fled from". The prophet Tiresias appears and is asked by Oedipus to make clear the meaning of the oracle. Tiresias then proceeds to carry out a sacrifice, which contains a number of horrific signs. As Tiresias does not have the name of King Laius' killer, he proposes to summon Laius' spirit back from
Erebus to learn the identity of the guilty one.
Act Three Creon returns from seeing Tiresias after he has spoken to Laius' ghost, but is unwilling to reveal to Oedipus the killer's name. Oedipus threatens him, and then Creon relents. He says Laius accuses the king of having blood on his hands, and who "has defiled his father's marriage-bed". He goes on to say that Laius promises the plague will cease if the king is expelled from Thebes. Creon advises Oedipus to
abdicate, but Oedipus believes that he has invented this story, along with Tiresias, in order to seize his throne. Despite Creon's protestations of innocence, Oedipus has him arrested.
Act Four Oedipus is troubled by the faint memory of a man whom he had killed on the road for behaving arrogantly before him while Oedipus was travelling to Thebes. An elderly messenger comes from Corinth to tell Oedipus that his father King Polybus has died and for him to come and take his throne. Oedipus does not want to return as he still fears the prophecy that he will marry his mother. The messenger then tells him that Corinth's queen is not his mother, and that he was given Oedipus as a baby on mount
Cithaeron. Oedipus then learns, after threatening the shepherd that gave him away, that he is, in fact, Jocasta's son.
Act Five A messenger relays the news that Oedipus contemplated suicide and wanted his body flung to wild beasts; but then Oedipus decided that his crime deserved something even more horrible, on account of the suffering Thebes has endured. He resolved to find a slow death for himself. He craved a punishment in which he would neither "join the number of the dead nor dwell among the living". The messenger goes on to explain how Oedipus tore out his eyes with his hands. The chorus question fate, each person's "commanding thread of life", and then hear Oedipus entering. He appears with both eyes removed and is confronted by Jocasta. She realises from his action that she, too, must punish herself for her crimes. While on stage, she takes his sword and kills herself with it. ==The role of the chorus==