The Sphinx comes to Thebes with a riddle and if you fail to solve it she kills you. Oedipus solves the riddle of the Sphinx and she kills herself instead. He would later become the king and the people saw him as a hero.
Creon returns with Tiresias
A plague has struck the city of Thebes. Many people, livestock, and plants are dying. Oedipus would later send Creon to the oracle where he would talk to Apollo.
Oedipus gets angry with Tiresias
After being sent to the oracle by Oedipus, Creon is going to talk to Apollo about the plague. Apollo tells Creon that to end the plague, they must kill the murder of King Laius.
Tiresias claims Oedipus is the curse
Since Apollo wouldn't say the name of the murder, the leader suggest that they should talk to Tiresias, who saw what the gods could see, and hope that he will tell them who the murder is. Creon would be sent to escort Tiresias back to Thebes where Oedipus would speak highly of him and praise him.
After talking with each other for awhile, Oedipus wanted Tiresias to tell who the murder is, but Tiresias refused to do so. After Tiresias didn't tell Oedipus who the murder was, Oedipus got angry and started to insult him.
After being insulted by Oedipus, Tiresias had enough and started to argue back with Oedipus. After arguing for awhile, Tiresias claims that Oedipus is the curse.