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Eris, Goddess of Chaos and Discord is one of the major recurring characters from The Grim Adventures of Billy and Mandy. She is voiced by Rachael MacFarlane, who is well known for voicing Hayley Smith in American Dad.
She is a goddess whose goal is to create destruction, suffering and general mayhem. The source of her powers is the "Apple of Discord", a golden apple that can be changed into any form for any purpose she wishes. However, she ostensibly has the personality of a spoiled modern teenage girl. In one episode, she has a romance with Hoss Delgado when she comes to Billy's house when the principal of his school comes over for dinner with the intention of ruining the meeting, and Hoss in turn comes to stop her. Despite their mutual attraction Hoss threatens to destroy Eris while Eris says she will banish Hoss to the "Puppet Dimension" if he tries anything. Eventually Eris summons giant alien zombie lobsters which destroy Billy's house and infuriate the principal, and she and Hoss make out onscreen, while Grim complains that this is inappropriate for a kids' show. In the credits sequence it is shown that Hoss was sent to the Puppet Dimension.