Malphas is a major antagonist of Dead of Summer. He possessed Amy Hughes, who was his perfect match, due to her being a complete psychopath who killed her family and her best friend, Margot. Malphas also briefly possessed Jessie Tyler, who attempted to save Amy, not knowing that she wanted Malphas.
Malphas is a demon at Lake Stillwater, who is very evil, and wants only to cause destruction on those who oppose him, such as Holyoke, and take the souls of them, as well. He wants to destroy the Earth, and anything or anyone that lives on it.