Question: what must oedipus do to save thebes?
Answer: The priests beseech Oedipus to save them from the plague, just as he saved them from the Sphinx (a creature with the body of a lion and the head of a woman that would eat those who could not answer its riddles.) Oedipus, ever a man of action, has already sent his brother-in-law, Creon, to Apollo the Prophet's oracle.