This segment, about a boy who is afraid of his grandmother, is based on the short story of the same name by Stephen King, published in the collection Skeleton Crew (1985).

The Twilight Zone's staff writers were unhappy when they were told that CBS had acquired the television rights for Stephen King's "Gramma", feeling that it would be almost impossible to adapt, since it consists mostly of internal monologues.

Faced with the choice of producing a segment from it or swallowing the considerable cost of licensing a Stephen King property, they turned the unenviable task of writing the teleplay over to story consultant Harlan Ellison.

[2] When George opens up the floor panel in Gramma's bedroom, the sounds which emerge are a collage of bacon frying, cicadas singing, and Harlan Ellison making raspy vocalizations.

[2] Gilbert Cruz ranked "Gramma" at number 9 out of 27 in a list of Stephen King television adaptations on Vulture.

Cruz remarked that Harlan Ellison's script does an astoundingly good job of making the uneventful story work for television and bringing out its emotional and metaphorical heart.