Creon was the main antagonist of the Oedipus Cycle plays and Antigone.
Oedipus Rex
In the first play, Oedipus Rex, Creon served Oedipus with joint power along with Jocasta, Creon's sister and Oedipus' mother and wife. Creon claims to enjoy his "power without responsibility" status when convicted of conspiricy with the blind prophet tiresias. Oedipus suceeded the throne of the city of Thebes, following the disappearance of the king Laius and his ability to solve the riddle of the Spinx who had previously plaugued Thebes. Creon later enforces Oedipus' exile as it is revealed that Oedipus was the one who killed Laius on his travels, and not only that, but Laius was Oedipus' father and Jocasta his mother. Jocasta, on discovering this, hangs herself, and then Oedipus stabs pins in his own eyes saying, "How can I look them in the eyes in the afterlife?" "How can I ever see joy again?" and "How can I look my cursed daughters in the eyes knowing nobody will ever marry them?". Creon promptly tells Oedipus to get back inside and stop drawing attention to himself in his laments, because it is unholy to see himself in this state. Creon does give one act of kindness at the end of the play, where he brings Oedipus his daughters so they can say their farewells. He draws a close to Oedipus' goodbyes saying, "You have cried enough." and a screaming Oedipus is thrown out of Thebes. Creon tells him that everything that had taken place was Oedipus's own fault.
Oedipus at Colonus
In the second play, Oedipus at Colonus, Creon serves a slightly more antagonistic role. Upon hearing that a great evil would soon befall Thebes if Oedipus did not return, Creon attempts to trick Oedipus into coming back. When Oedipus refuses, Creon attempts force him to come back by taking his children from him and bringing them back to Thebes, hoping Oedipus will give chase. When this attempt fails, he tries to physically bring Oedipus back, but to no avail.
Antigone
Creon in the 1984 TV version of Antigone.
Creon shows true evil in the final play, Antigone, when he denies a burial to his dead son, Polynices, for waging war against Thebes to earn back his throne. He declared that Polynices's corpse would rot out in a field where buzzards and dogs could feast upon it, and that none should mourn him. When his niece, Antigone, defies his law and buries Polynices out of love for her brother, Creon, ultimately, imprisons her inside of a small vault.