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The Mattress Demon is the main antagonist of the episode "The Demon in the Mattress." She is an evil spirit that resides with a mattress. She makes her presence known by manifesting a face to frighten Courage. She later takes possession of Muriel, changing her appearance to green skin with wavy orange hair and a deep, demonic voice. Courage and Eustace spend most of the episode trying to get rid of the evil spirit. Courage uses the incantation to drive the spirit out of Muriel, only for her to possess Eustace minutes later. Muriel knocks him out and orders the mattress to be taken back.
Gallery[]
Muriel & Eustace under possession by the demon
Quote[]
“Won’t you join me?” - The Demons first line, after possessing Muriel’s body.
“Oh, can one of you boys give me a hand?” - After Muriel’s head gets detached from her body.
Trivia[]
It is unknown what the demon was doing to Muriel, but judging by her shout of "Courage, HELP ME!" when she suddenly reappears, it must have been something bad.
The demon's gender is presumed by fans to be female, though the gender was never specified on-screen and she is voiced by Tom McKeon, a male. It is mainly presumed because the demon changed Muriel's voice and not Eustace's.
For a long time, it was speculated Jim Cummings voiced the demon, until Behind the Voice Actors confirmed it was Tom McKeon.
