The title refers to "Oedipus Rex," which, in English, is "Oedipus the King." This play from the Greek classical era is attributed to Sophocles. It focuses on Oedipus, who unknowingly fulfills the prophecy that said he would kill his father and marry his mother. When he discovers what has happened, his wife/mother hangs herself and Oedipus gouges out his own eyes.
This Episode Marks The Final Time Brian and Casey Go on separate dates