Lisa's Date with Density a child from Josh Weinstein's school days who everyday would get onto the bus with a piece of toast, which had Vaseline on it. A majority of the story is a reference to the film "Rebel Without a Cause". Lisa remarks that Nelson is "like a riddle wrapped in an enigma wrapped in a vest", a reference to "a riddle wrapped in a mystery inside an enigma"; this was Winston Churchill's opinion of Russia at the outbreak of the World War II. In its original broadcast, "Lisa's Date with Density" finished 63rd in ratings for the week of December 9–15,
Mystery in Space editor and the series changed significantly. Schiff introduced Space Ranger, a long-running character from "Tales of the Unexpected", another DC anthology title he edited, while Adam Strange was given a new writer, Dave Wood, and artist, Lee Elias, as Carmine Infantino had moved with Schwartz to his new titles. Space Ranger would slowly edge Adam Strange out - taking the cover of four of the next ten issues and sharing two more with Adam Strange (neither appeared on the cover to #100 (June 1965)), co-featuring in the story "The Riddle of Two Solar Systems" ("Mystery In Space" #94, September 1964)