After King Agamemnon is murdered by his wife Clytemnestra and her lover and relative Aegisthus with the help of her brother Orestes and his cousin Pylades .
His wife Clytemnestra and her lover and relative Aegisthus is the daughter Electra decides to get even .
After King Agamemnon is murdered by his wife Clytemnestra and her lover and relative Aegisthus , the daughter Electra decides to get even , with the help of her brother Orestes and his cousin Pylades .