Art identification by Alberto Becattini (January 2011).
Molno pencils per Lee Hartsfeld:
Previous indexer credited Sal Trapani.
Both the opening narration by Uncle Boris and the closing narration contain the words "The Twilight Zone". This story was probably intended for that title and then switched to this one. But though images of Karloff were added to the splash panel and the final panel, no one edited out the words identifying where the story was clearly meant to run when it was commissioned.
Half page of mini-comics.
Gaylord Du Bois script credit for Pteranodon as per page 174, "Gaylord Du Bois's Account Books, Sorted by Title, compiled from the original account books by Randall W. Scott." Gaylord Du Bois script identification confirmed by David Porta, April, 2016.