A ghost is the apparition of someone who has died. Popular culture has depicted a wide variety of ghosts associated with Halloween and works of fiction meant to be scary. Ghosts have been portrayed on a spectrum from genuinely frightening or gory, to lighter depictions meant as fun or even friendly.
The most recurring style of Muppet ghosts debuted in The Muppet Show and have appeared in a number of other productions. A different ghost puppet appeared in episode 307 of The Muppet Show, echoing the dance moves of Alice Cooper in "Welcome to My Nightmare" and Thog in "Once a Year Day."
Additional ghosts and spirits of varying designs have appeared throughout other Muppet productions, most notably The Muppet Christmas Carol and Muppets Haunted Mansion, and as the titular character in The Ghost of Faffner Hall.