This episode is based on the short story "Mute" by Richard Matheson.

Frank Overton is also in "Walking Distance."

Oscar Beregi is also in "The Rip Van Winkle Caper" and "Deaths-Head Revisited."

Percy Helton was also in "Mr. Garrity and the Graves."

Robert Boon is also in "Deaths-Head Revisited."

Ann Jillian is best known for her role in It's A Living.

Opening Narration
Narrator: What you're witnessing is the curtain-raiser to a most extraordinary play; to wit, the signing of a pact, the commencement of a project. The play itself will be performed almost entirely offstage. The final scenes are to be enacted a decade hence with a different cast. The main character of these final scenes is Ilse, the daughter of Professor and Mrs. Nielsen, age two. At the moment she lies sleeping in her crib, unaware of the singular drama in which she is to be involved. Ten years from this moment, Ilse Nielsen is to know the desolating terror of living simultaneously in the world--and in the Twilight Zone.

Closing Narration
Narrator: It has been noted in a book of proven wisdom that perfect love casteth out fear. While it's unlikely that this observation was meant to include that specific fear which follows the loss of extrasensory perception, the principle remains, as always, beautifully intact. Case in point, that of Ilse Nielsen, former resident of the Twilight Zone.

The story was first published in the Charles Beaumont edited anthology The Fiend in You 1962.