The Monster Who Lives Under The Bed is a minor character from The Nightmare Before Christmas.
This monster is rarely seen with only his red eyes and sharp teeth visible.
He is scary and creepy.
The monster is seen briefly during the opening song "This is Halloween" while he's under the bed saying the line "I am the one hiding under your bed, teeth ground sharp and eyes glowing red!".
The Monster under the bed makes a physical appearance for the queue of this ride, being shown guiding guests to the load area with a sign for, "Sleigh Rides". He is also depicted as having tentacles with candy-cane like patterns on them.
The monster is also featured throughout the ride in artwork such as in a stretching room portrait, the load area's "Scary Christmas" display, and one of Madame Leota's tarot cards.