In The Grim Adventures of Billy and Mandy, X is the goddess of Y.X’s name is similar in sound to the word ‘Heiress’, as in a ‘spoiled little rich girl’. She used to receive a large allowance from her Father (“Daddy“) every month until she was cut off for all the trouble that she was causing. She is portrayed as a curvaceous and beautiful, but vindictive, blonde-haired woman with a gap in her teeth.She is the keeper of the Z, a golden apple that can transform into any shape to assist her into wreaking havoc.
In one episode, she gives the apple to the trio, Grim tries to seal it away, Mandy wants to become the new goddess of Y, and Billy is…well Billy. The three eventually end up fighting over it until X returns, glad with the outcome of her plan, and leaves with Z.
Id X,Y and Z. What Incident in Greek mythology does the episode parody?