Orestes arrives in Argos, meets his sister and mother, and discusses the situation with Zeus. The act ends when he commits to staying in town.
Electra tries to save the people of Argos – to no avail. Orestes experiences his epiphany and resolves to kill the royal couple. He does so. The act ends when he and his sister head for Apollo's shrine.
Electra and Orestes deal with the furies in the aftermath of the murders. Orestes verbally dukes it out with the king of gods and wins, though he loses Electra in the process. He delivers his "coronation" speech and leaves town.